The Manual is compiling some of the most significant news items regarding COVID-19 to help people stay up to date.
News items compiled by Fred R. Himmelstein, MD, FACEP.
February 22, 2021
When could the United States reach herd immunity? It’s complicated
An article in the New York Times on February 20 provided some nice graphic presentations about the path to herd immunity in the US. The article points out that the time to reaching herd immunity can be affected by a number of variables and unknowns. The following are some of these variables and unknowns:
February 19, 2021
Measuring ambient carbon dioxide to assess risk of inhaling COVID-19
COVID-19 is transmitted in airborne droplets from an infected person’s breath. The amount of airborne droplets increases with coughing, speaking loudly, and singing. In an enclosed space such as a bar, restaurant, or gym, the ventilation of the air can be assessed by measuring carbon dioxide (CO2) in the air. CO2 is exhaled with each breath. If the ventilation is poor, the level of CO2 rises.
Handheld CO2 measuring devices are available and some report using them to assess ventilation. An article in the Washington Post on February 10, 2021, discusses this idea. There are many factors to consider, including what other sources of CO2 there may be such as cooking ovens, etc.
link: The Washington Post
February 17, 2021
Who Needs to Quarantine?
On February 11, 2021, the CDC updated it guidelines for when to quarantine after exposure to or close contact with someone who has or has tested positive for COVID-19. The updated guidelines now state if you have been fully vaccinated in the last three months and don’t have any symptoms you do not need to quarantine after close contact. People who have tested positive for COVID-19 within the past three months and recovered do not need to quarantine or get tested again as long as they do not develop new symptoms. If someone develops symptoms again within three months of their first bout of COVID-19, they may need to be tested again if there is no other cause identified for their symptoms. Otherwise, quarantine is required for those who have been in close contact with someone who has COVID-19. Close contact is defined as being within six feet of someone with COVID-19 for a total of 15 minutes or more, providing care at home for someone who is sick with COVID-19, having direct physical contact with a COVID-19 infected individual (hugged or kissed them), sharing drinking or eating utensils, or having them sneeze or cough on you. The CDC site also discusses options to reduce the time of quarantine.
February 16, 2021
Viral load is primary driver of transmission of SARS-CoV-2
Analyzing data from a Spanish study initially designed to determine the effectiveness of hydroxychloroquine in reducing transmission of SARS-CoV-2, researchers saw the secondary attack rate increased from 12% when the index case had viral load < 1 x 106 copies/mL to 24% when the index case had viral load ≥ 1 x 1010 copies/mL. This study, published in the Lancet on February 2, 2021, found that viral load was the primary driver of transmission. Other factors associated with an increased risk of transmission were household contacts and increasing age of the contact. Factors that did not predict transmission were reported mask usage of the contact and respiratory symptoms of the index case (eg, cough, shortness of breath [dyspnea], and runny nose [rhinitis]). Additionally, it was found that higher viral loads in the swabs of asymptomatic contacts were associated with a high risk of developing symptomatic disease and that these contacts had shorter incubation periods than those with lower viral loads.
February 9, 2021
Coronavirus variants and mutations
The New York Times has provided an excellent explanation of how the coronavirus evolves. As the virus multiplies, new mutations arise as errors are made in replication of the virus’ genetic code. These mutations give rise to new variants which then multiply and spread on their own. This article provides a detailed summary of the important variants that scientists are currently aware of.
February 4, 2021
Infection with SARS-CoV-2 in antibody-positive patients
This prospective study assessing the risk of reinfection with SARS-CoV-2 was published in preprint on January 29, 2021, on the MedRxiv server. A cohort of 3,249 Marine recruits was followed over a six-week period. Following a 2-week quarantine and testing period, 3,076 were negative on 3 weekly polymerase chain reaction (PCR) tests for the SARS-CoV-2 virus. Of these, 225 were seropositive for 2 separate antibodies to the virus, and the remainder were seronegative. These recruits were followed for the next six weeks clinically and with multiple PCR tests. The study found that 19/189 (10.1%) seropositive participants had at least one positive PCR test, whereas 1,079/2,246 (48%) seronegative participants tested positive. The authors point out that the high risk of infection in those participants who were previously seronegative is likely due to the crowded living conditions, requirement for personal contact, and demanding regimen during basic training. Thus, although antibodies induced by the initial infection are largely protective, they do not guarantee against subsequent infection.
February 3, 2021
Russian COVID-19 vaccine is reported to have 91.6% efficacy in reducing confirmed cases
The preliminary results of the phase 3 study for the Russian vaccine, Gam-COVID-Vac (called Sputnik V), was published in The Lancet on February 2, 2021. The study was a randomized, double-blind, placebo-controlled trial conducted in Russia. In the fall of 2021, 21,977 adults were randomly assigned to the vaccine group (n = 16,501) or the placebo group (n = 5476). Study participants received 2 doses of the vaccine with an interval of 21 days between. The primary endpoint of the study was the proportion of participants with COVID-19 confirmed by polymerase chain reaction (PCR) testing from 21 days after receiving the first dose (day of second dose). The results showed that the vaccine was 91.6% effective. The observed vaccine efficacy was greater than 87% in all age and sex subgroups. Notably, vaccine efficacy was 91·8% in participants older than 60 years. There were no cases (vaccine group) and 20 cases (placebo group) of moderate or severe COVID-19 confirmed at least 21 days after dose 1; thus, vaccine efficacy against moderate or severe COVID-19 was 100%. Most adverse effects were mild. None of the serious adverse events were considered vaccine related. The authors concluded that this interim analysis showed that the Gam-COVID-Vac vaccine in participants aged 18 years or older in Russia was highly efficacious, able to create a substantial immune response, and was well tolerated.
January 29, 2021
Moderna Announces Strategy to Counter New Viral Variants
The British Medical Journal reported online, January 26, 2021, that Moderna has announced that it is developing two new approaches to the emerging variants of COVID-19. Studies have shown a six-fold reduction in neutralizing antibodies to the South African variant, causing concern that immunity might wane. Although the current vaccine was effective both against the South African and UK variants, “out of an abundance of caution,” Moderna was exploring two different approaches to deal with this concern. One approach is to see whether a third booster dose of the current vaccine would further increase neutralizing titers against emerging variants. The other is a booster candidate mRNA vaccine that it has developed specifically against the South African variant. Moderna said it was beginning phase 1 studies in the US to see whether this modified vaccine with variant-specific proteins would increase the immunological effect against the South African virus. A trial of a few thousand participants for the new approaches would be divided into two groups. One group would receive a booster third dose of the original two-dose vaccine, while a second group would receive the new booster vaccine, mRNA-1273.351.The new approach may be ready by the autumn, and authorization by the Food and Drug Administration may be quicker than the long phase I, II, and III trials required for a new vaccine.
January 27, 2021
United Kingdom COVID-19 variant is likely more lethal
The Scientific Advisory Group for England (SAGE), advises governmental decision makers on science at times of emergency and at present they frequently meet to deal with the current pandemic. In their meeting on January 21, 2021, they discussed COVID-19 variant B.1.1.7. This viral variant, which was first identified in the United Kingdom in December 2020, was seen to be more easily transmitted and now has quickly become the dominant variant in much of the United Kingdom. New data suggest there is a 30% to 40% increase in the lethality with the new variant. The case fatality rate increase was seen across all age groups. The studies and data used in the analysis are found in the minuets of the January 21, 2021, meeting. Although the data are preliminary, advisors concluded there is a realistic possibility of increased risk of death compared to other variants.
December 18, 2020
COVID-19 transmission among students and staff in educational facilities in Italy
A detailed epidemiological investigation was done to determine the secondary attack rate of COVID-19 cases occurring in school children and staff in 41 classes in 36 schools in the Reggio Emilia province of northern Italy from their reopening on September 1 to October 15, 2020. There were 48 index cases (43 students, 5 staff) among about 1,000 students and 200 staff. During the epidemiological investigations, 1,200 contacts of these index cases were investigated and 38 secondary cases found (3.8%), all resulting from student cases. However, the secondary attack rate varied widely among age groups, with 14 preschool and elementary school cases having a 0.38% secondary attack rate, and 28 middle and high school cases having a 6.46% secondary attack rate. The low secondary attack rate in preschool and elementary schools was in line with other studies published to date. However, secondary schools had a significantly higher rate of transmission than reported in many but not all earlier studies.
December 11, 2020
How the Pfizer-BioNTech Vaccine Works
The experts of the FDA’s Vaccine Advisory Panel recommended that the FDA grant Emergency Use Authorization to the Pfizer-BioNTech vaccine against COVID-19. The New York Times published an explanation of the technology behind the new vaccine.
link to vaccine announcement: https://www.nytimes.com/2020/12/10/health/covid-vaccine-pfizer-fda.html
link to vaccine explanation: https://www.nytimes.com/interactive/2020/health/pfizer-biontech-covid-19-vaccine.html
December 9, 2020
Here's why vaccinated people still need to wear a mask
An article published in the New York Times on November 8, 2020, provided a summary of how vaccines work for respiratory viruses such as COVID-19. The new vaccines will probably prevent you from getting sick with COVID-19. No one knows yet whether they will keep you from spreading the virus to others — but that information is coming.
December 8, 2020
Health care personnel and residents of long-term care facilities to be offered COVID-19 vaccine in initial phase of vaccination program
The Advisory Committee on Immunization Practices (ACIP) interim recommendations for allocating COVID-19 vaccine was published in the CDC's Morbidity and Mortality Weekly Report on December 3, 2020. The report discusses guidance for the initial phase of the national COVID-19 vaccination program. The committee recommends that health care personnel and residents of long-term care facilities be offered the vaccine in the initial phase. The report acknowledges that even if one or more vaccine candidates receive authorization for emergency use, the demand for the vaccine is expected to exceed supply during the first months of the national vaccination program. The committee noted that health care settings in general, and long-term care settings in particular, can be high-risk locations for SARS-CoV-2 exposure and transmission. The committee believes that protection of health care personnel is critical to preserve capacity to care for patients with COVID-19 or other illnesses. Long-term care facility residents, because of their age, high rates of underlying medical conditions, and congregate living situation, are at high risk of infection and severe illness due to COVID-19. This was underscored by reporting that as of November 15, 2020, approximately 500,000 COVID-19 cases and 70,000 associated deaths had been reported among residents of skilled nursing facilities.
The COVID-19 workgroup was comprised of experts on vaccines and ethics. They held more than 25 meetings to review data regarding vaccine candidates and COVID-19 surveillance and modeling as well as vaccine allocation literature published and in external expert reports. In addition, there were seven public ACIP meetings addressing COVID-19 vaccine topics. The committee was guided by the principles of maximizing benefits, minimizing harms, promoting justice, and mitigating health inequities The interim recommendation might be updated based on additional safety and efficacy data from phase III clinical trials and conditions of FDA Emergency Use Authorization.
December 3, 2020
Delirium is common in older patients presenting with COVID-19
Delirium is an acute stage of confusion characterized by disturbances in attention, consciousness, and cognition. Delirium is known to be a common presenting symptom for older adults with severe disease and is associated with adverse outcomes, including prolonged hospitalization and death. A study, published in JAMA Network Online on November 19, 2020, used a cohort of 847 consecutive patients who were age 65 years or older who presented to the emergency department at 7 sites across the US and subsequently received a diagnosis of COVID-19. Notably, delirium was found in 28% of the 847 patients and was the main presenting symptom in 16% of these patients. Overall, delirium was the sixth most common of all presenting symptoms and signs. What's more, 37% of the patients with delirium had no other typical symptoms of COVID-19 such as cough and fever. Delirium at presentation also was significantly linked to an increased risk for poor hospital outcomes, including intensive care unit stay and death. Factors that contributed to whether a patient would present with delirium included age over 75 years, residing in an assisted living community or skilled nursing facility, prior use of psychoactive drugs, vision or hearing impairment, stroke, and Parkinson's disease. This study emphasizes the importance of delirium as a presenting symptom of COVID-19 in older patients.
November 30, 2020
COVID toes: A manifestation of viral-induced immune overactivity
During the COVID-19 pandemic, there have been reports of itchy and painful red patches, swelling, and blistering of the toes and rarely of the heels and fingers. This condition is called chilblains, but it has been referred to as “COVID toes” during the pandemic. A report in JAMA Dermatology discussed 40 patients who presented with chilblains-like lesions to a COVID clinic in Nice, France within a period of less than two weeks. This presentation was very unusual because the area around Nice is temperate. The manifestations of chilblains-like lesions corresponded with the local spread of SARS-CoV-2. Most patients were young and without additional medical problems. Researchers found these patients all had signs of an overactive immune response. Of note, all patients in the series had negative PCR test results for COVID-19, and only about 30% had antibodies against the virus. Twenty-four patients (60%) reported contact with possible COVID-19 cases, and 11 (27.5%) met the definition for possible COVID-19 within the 6 weeks preceding the onset of chilblains-like lesions.
The article examined the potential link between these skin lesions and SARS-CoV-2 infection. The researchers observed a significantly higher immune response in patients with chilblains-like lesions compared with those with moderate or severe COVID-19. They believe the exaggerated immune response may also explain the relatively low rate of SARS-CoV-2 seropositivity in patients with chilblains-like lesions because those patients were able to clear the infection before antibody immunity occurs. The article concluded that these lesions are manifestations of virus-induced excessive immune response and suggested that this was caused by SARS-CoV-2 infection, but they stated that definitive proof of a causal link between COVID-19 and chilblains-like lesions is not demonstrated.
November 24, 2020
FDA issues emergency use authorization for first home test kit for COVID-19
Lucira Health received FDA emergency authorization for a COVID-19 self-test kit. This all-in-one test kit is intended to detect the SAR-CoV-2 virus that causes COVID-19. The all-in-one test is authorized for prescription home use for individuals age 14 and older if their doctor suspects they have COVID-19. The test can also be used in doctor’s offices, hospitals, urgent care centers, and emergency rooms. This test was able to accurately detect 94.1% of the infections when compared to other high-sensitivity PCR tests. The test has not been evaluated in people who are asymptomatic.
Here's how it works: You place the provided vial into the battery-powered testing unit, swab your nose (as you do in other nasal COVID-19 tests), stir the swab into the vial, and then cap the vial and press down until you hear a click and the "ready" light starts blinking. After the test is completed the results will light up as either positive or negative in about 30 minutes.
November 23, 2020
COVID-19 vaccine important to fight pandemic, but success depends when and how vaccine reaches people
A new study explored how effective various COVID-19 vaccines would be at reducing susceptibility to infection, hospitalizations, and deaths. Although vaccine trials have reported high rates of effectiveness, effectiveness will decrease when vaccine is administered outside the carefully controlled circumstances of a clinical trial. Researchers found that a vaccine’s success depends not only on how effective the vaccine itself is but how effective the manufacture and distribution are. Other factors that will influence success include how willing people are to receive a vaccine (or return for a booster dose) and how well people continue to practice routine public health measures such as hand washing, mask wearing, and social distancing.
November 10, 2020
A mutation can help the SARS-CoV-2 virus evade the body's immune response
Researchers from the University of Glasgow Centre for Viral Research report on N439K, a variant of the SARS-CoV-2 virus with a mutation that enables it to evade the body's antibody-mediated immunity while maintaining virulence.
The N439K mutation was first identified in Scotland and subsequently appeared in 12 countries, including the United States, and is the second most commonly observed variant worldwide.
The receptor binding domain (RBD) is the portion of the viral spike protein that allows the virus to enter into cells. The receptor binding variant with the N439K mutation is associated with similar clinical spectrum of disease and slightly higher viral loads in vivo compared with variants without this mutation. Also, the N439K mutation binds better to human cells and multiplies a little faster. These characteristics may be cause for concern should the version of the SARS-CoV-2 virus with the N439K mutation become prevalent worldwide.
November 2, 2020
Monoclonal antibodies against COVID-19 show promise in ongoing trial
In a news release on October 28, 2020, Regeneron updated results in the ongoing outpatient trial of its monoclonal antibody cocktail, REGN-COV2 (a combination of two monoclonal antibodies). This update added an additional 524 patients, to the 275 patients initially reported in an earlier press release. The trial is a randomized, double-blind study measuring the effects of adding REGN-COV2 vs placebo to the usual standard of care. Regeneron announced that the ongoing phase 2/3 trial of their monoclonal antibody cocktail had positive results and met the primary endpoint and a key secondary endpoint. Notably REGN-COV2 significantly reduced the viral load and patient medical visits for a cohort of patients with mild to moderate COVID-19. Regeneron has shared these results with the U.S. FDA, which is reviewing an Emergency Use Authorization submission for the REGN-COV2 low dose for treatment of adults with mild-to-moderate COVID-19 who are at high risk for poor outcomes.
October 27, 2020
Considerations for an emergency use authorization of COVID-19 vaccines
A perspective, published in the New England Journal of Medicine on October 16, 2020, discussed some of the issues related to making a COVID-19 vaccine available under an emergency use authorization. The authors point out the need to balance the urgency of having a vaccine to respond to a grave public health emergency vs. the need to have sufficient data on safety and efficacy. The authors discuss the reasoning behind their recommendation that clinical trial participants be monitored for two months after vaccine administration to gather adequate data to support an authorization for emergency use. They point out that although most adverse events linked to vaccination start within six weeks after vaccine receipt, full safety and efficacy evaluations require a longer follow-up period. They warn that any curtailment of this minimal follow-up period would undermine the scientific credibility of and public confidence in the decision to authorize any vaccine for use under an emergency use authorization.
October 20, 2020
Likelihood of pregnant women infected with SARS-CoV-2 transmitting the virus to their newborns is low
A study published in JAMA Pediatrics online on October 12, 2020 finds that separating mothers who are positive for COVID-19 from their newborns may not be warranted and direct breastfeeding appears to be safe. A retrospective cohort analysis of the first 101 neonates born to 100 mothers with perinatal SARS-CoV-2 infections at two large hospitals affiliated with the Columbia University Irving Medical Center from March 13 to April 24, 2020, found the overall incidence of transmission was 2.0% (95% CI, 0.2%–7.0%—2 newborns), and no evidence of clinical infection among the cohort of infants. In addition, 55 infants were followed up in the first 2 weeks of life in a new COVID-19 Newborn Follow-up Clinic, all of whom remained healthy. To the author's knowledge this was the largest series of newborns born to mothers positive for or with suspected SARS-CoV-2 infection to date. Overall, there was no clinical evidence for neonatal COVID-19 infection. The study endorses retaining evidence-based newborn care practices such as rooming in, establishing breastfeeding, and delaying bathing and suggests that separating mothers positive for SARS-CoV-2 from their newborns and avoiding direct breastfeeding may not be warranted.
October 19, 2020
World Health Organization study finds remdesivir and other repurposed drugs ineffective in COVID-19
The World Health Organization (WHO) recently conducted a large-scale randomized, but not blinded or placebo-controlled, trial to evaluate the efficacy of four repurposed antiviral medications in the treatment of COVID-19. The antiviral medications included remdesivir, hydroxychloroquine, lopinavir (fixed-dose combination with ritonavir), and interferon. The trial involved 11,266 adult patientswith COVID-19 admitted to 405 hospitals in 30 countries. Patients were randomly divided into different drug groups and received whichever study drugs were locally available or open control. In this study, 2,750 patients received remdesivir, 954 received hydroxychloroquine, 1,411 received lopinavir, 651 received interferon and lopinavir, 1,412 received only interferon, and 4,088, the control group, did not receive any study drug. The study found that none of these medications reduced the initiation of ventilation, mortality, or duration of hospital stay when compared to the control group. The non-peer-reviewed data has been posted to the medRxiv preprint server by the SOLIDARITY investigators.
October 15, 2020
Excess deaths and effects of the COVID-19 pandemic
An editorial in the October 12, 2020, issue of the Journal of the American Medical Association summarized and commented on several reports published in that issue of the Journal regarding the mortality, economic, and emotional costs of the COVID-19 pandemic in the United States. From March 1 through August 1, 2020, a total of 1,336,561 deaths occurred in the United States, a 20% increase over expected, representing 225,530 excess deaths, 67% of which were attributable directly to COVID-19. The other excess deaths are reasonably attributable to other factors related to the pandemic. Projecting this 5-month period through the remainder of 2020 suggests that more than 400,000 excess deaths will have occurred this year—approaching the number of US deaths from World War II. Another article draws attention to other consequences of the pandemic, suggesting that for every death an estimated nine family members are affected by prolonged grief or symptoms of posttraumatic stress disorder. And another article estimates the financial costs of the pandemic.
October 9, 2020
COVID-19 antibodies in convalescent plasma donations wane by 3 to 4 months
A longitudinal study done in Quebec, Canada, reported by Healio News, and published as a letter in the journal Blood on October 1, 2020, reported on 15 convalescent plasma donors who donated their plasma multiple times. Their first donation was 33 to 77 days after symptom onset and their last donation was 66 to 114 days after. Anti-receptor-binding domain (RBD) antibodies were present at the first donation for all donors, and the level decreased between first and last donation for all donors. The researchers divided the timing of donations into four quartile ranges (33-53, 54-69, 70-84, and 85-114 days). Antibody levels remained stable between the first, second, and third quartiles with a small but not statistically significant decline. In contrast, between the 3rd and 4th quartiles, there was a marked decreased (36.8%; p = 0.0052) in antibody levels. This finding informs people recovering from COVID-19 who want to donate blood plasma that they should not wait too long once they become eligible, and informs clinicians that they should check donated plasma for the presence of antibodies before giving to patients.
October 8, 2020
Study shows high-risk contact plays an important role in COVID-19 transmission in India
In one of the largest studies to date on transmission of COVID-19, contact tracing efforts reached 3,084,885 individuals exposed to 84,965 test-positive coronavirus patients in two states in India. Researchers looked at 575,071 contacts who had individual epidemiological data as well as laboratory test results available. The study was published in Science on September 30, 2020. Researchers from Princeton Environmental Institute, John Hopkins University, and University California Berkeley collaborated with public health officials in the South East Indian states of Tamil Nadu and Andra Pradesh. The data showed that infected patients came into contact with about 7 people, on average, and that 71% of positive patients did not infect any contacts. For high-risks contacts (who had close social contact or direct physical contact with index cases without protective measures), the transmission rate (from an index case to an exposed contact) was about 10.7%. For low-risk contacts (proximity of index cases but did not meet these criteria for high-risk exposure), the transmission rate was about 4.7%. In the study, children and young adults were the key demographics spreading the virus, and most often they spread the virus to someone their own age. This demographic is potentially more important in transmitting the virus then has been identified in previous studies. The study highlights the role of transmission by high-risk contact.
October 2, 2020
Immunological abnormalities may explain why some otherwise healthy patients develop severe COVID-19
Two studies recently published in the journal Science shed some light on why people may develop severe COVID-19. What researchers found is that some patients have antibodies against interferon proteins and others have inborn errors or genetic mutations that impede interferon production and function. In looking for interferon antibodies in patients with severe COVID-19 pneumonia, they found that among the 987 patients they tested with severe COVID-19, 101 of the patients had neutralizing auto-antibodies against type 1 interferons. In comparison, among 663 people who developed asymptomatic or mild COVID-19, none had the anti-interferon antibodies. Researchers also found that patients over age 65 were more likely to develop interferon antibodies. Interferons are a set of 17 crucial proteins that protect cells in the body from viruses.People who lack type I interferons cannot mount an effective immune response. The researchers have previously shown that a significant number of patients with severe COVID-19 carried a rare genetic variant in 13 genes critical for the body's immune defense against influenza, and in this study, they found similar mutations in (3.5%) 23 of 659 patients with severe COVID-19 pneumonia. This finding may provide a better understanding of why some people develop severe disease while others do not. The patients who developed severe COVID-19 pneumonia were completely missing a functioning gene and did not produce any detectable type I interferons in response to SARS-CoV-2 infection. Overall, inborn errors and immunological anomalies causing an absence of type 1 interferons might play a role in up to 14% of the most serious cases of COVID-19 infection. These two publications highlight the crucial role of type I interferons in protective immunity against SARS-CoV-2.
September 23, 2020
Differing immune responses to SARS-CoV-2 infection in hospitalized pediatric and adult patients
A study done at Albert Einstein College of Medicine Children's Hospital Montefiore and Yale University compared the immune responses of adults and younger patients with COVID-19 in attempt to study why children typically have milder disease than adults. The study compared cytokine, humoral, and cellular immune responses in young (age < 24 years, n = 65) and adult (n = 60) patients with COVID-19. As expected, the study found children fared clinically much better than the adults.
The data also showed that younger patients exhibited more robust innate immunity than adults as demonstrated by higher levels of the cytokine interleukin-17 (IL-17), which is associated with the innate immune system. On the other hand, adults mounted a more robust T-cell response to the viral spike protein, had higher serum neutralizing antibody titers, and had more robust antibody-dependent cellular phagocytosis compared to younger patients. Researchers also found that neutralizing antibody levels were higher in adult COVID-19 patients who died or required mechanical ventilation than in those who recovered, and significantly higher than the levels detected in the younger patients.
These findings suggest that perhaps young peoples’ more robust innate response helps protect them from developing severe disease and often fatal outcomes, and, as a corollary, that boosting the T-cell and antibody response, particularly late in the course of disease, may not be helpful.
September 16, 2020
Assessing your risk of attending an event during the pandemic
In the mist of the pandemic, knowing the risk of encountering a COVID-19–positive patient while attending an event would be important information in deciding whether to attend that event. As many parts of the country begin to open up, being able estimate the risks involved in resuming nonessential activities is crucial. There is a tool, COVID-19 Event Risk Assessment Planning Tool, developed by Georgia Tech that incorporates data from The New York Times case count and the Covidtracking.com dashboard and is updated daily. This interactive map will show you down to the county level how likely you are to come across someone with COVID-19 at an event of a certain size. The tool expresses the risk level in percentage of there being at least one person with COVID-19 present an event in a given county based on the size of the gathering. The calculator assumes that every person attending an event is as likely to be infected as anyone else in a given area. The calculator can be adjusted for ascertainment bias, which takes into account a multiple of how many more cases there are than are being reported. Based on these assumptions, results of the calculation can be regarded as an approximation. For example if you were to attend a wedding in Los Angeles County with 100 people in attendance, using an ascertainment bias of 10, there is a 74% chance that at least one person would be infected with COVID-19. The risk would be 61% in Philadelphia but less than 1% in Wetzel County West Virginia.
September 15, 2020
Study disputes "cytokine storm" being responsible for severe outcomes in COVID-19
New research suggests that disease severity in patients with COVID-19 may not be due to cytokine storm. Cytokine storm is an immune reaction in which cytokines, which are a normal part of the body’s immune response, are released in such high numbers the body overreacts. In a study published in JAMA, researchers from Radboud University Medical Center in the Netherlands measured the concentration of three cytokines in the blood of patients admitted to the intensive care unit with
Patients who already had disorders that caused immunodeficiencies or required drugs to suppress the immune system were not included in this study.
Researchers found that the level of all three cytokines were significantly lower in COVID-19 patients then in patients with bacterial septic shock with ARDS. Cytokine concentrations in COVID-19 patients were similar to those in ICU patients with trauma or cardiac arrest. The results of this study showed that COVID-19 is not characterized by cytokine storm, challenging previous reports and assumptions that cytokine storm plays a major role in the more severe outcomes in patients with COVID-19. Whether anticytokine therapies will benefit patients with COVID-19 remains to be determined.
September 8, 2020
Systemic corticosteroids and mortality in critically ill patients with COVID-19
Corticosteroids are clearly shown to reduce mortality for critically ill patients with COVID-19. These are the findings in a meta-analysis of seven prospective, randomized trials including 1,703 patients published in JAMA on September 2, 2020. The meta-analysis was based on a relatively large number of critically ill patients with COVID-19 from geographically diverse sites. Of the 1,703 patients in the trial, 647 died by 28 days after randomization. Mortality rate among patients receiving standard care was 40%, this dropped to 32% in those treated with corticosteroids. This was a highly statistically significant difference (p < 0.001). This finding was true for patients requiring mechanical ventilation as well as for those who required supplemental oxygen but not a ventilator. The meta-analysis also revealed little difference in serious adverse events for patients who received corticosteroids versus those who did not. Based on the clear benefit that corticosteroids showed for critically ill patients, the World Health Organization released updated guidance recommending use of systemic corticosteroidsfor the treatment of patients with severe and critical COVID-19.
link to the study: https://jamanetwork.com/journals/jama/fullarticle/2770279
August 28, 2020
Novel intranasal COVID-19 vaccine elicits strong, widespread immune response and prevents infection in mice
Washington University School of Medicine announced the development of a novel COVID-19 vaccine. Unlike other vaccines in development for COVID-19, this vaccine is administered intranasally. Mice given this vaccine developed a strong immune response, particularly in the lining of the nose and upper respiratory tract. The senior author of the paper, Michael S. Diamond, MD, PhD, said "these mice were well protected from disease, and in some of the mice, we saw evidence of sterilizing immunity, where there is no sign of infection whatsoever after the mouse is challenged with the virus." The vaccine uses as a vector an adenovirus that has been rendered harmless and has the spike protein from the coronavirus inserted. The new vaccine also incorporates two mutations into the spike protein. These mutations stabilize it into a specific shape that is most conductive for forming antibodies against it. Comparing nasal administration to intramuscular injection, the researchers found intranasal delivery prevented infection in both the upper and lower respiratory tracts. Although intramuscular injection induced an immune response that prevented pneumonia, it did not prevent infection in the nose or lungs. One promising finding was that a single intranasal dose produced such a robust immune response that a second dose should not be needed. Researchers will soon begin studying the intranasal vaccine in nonhuman primates and plan to move into clinical trials in humans as quickly as possible. This study was published online in Cell on August 19, 2020.
link to press release: https://medicine.wustl.edu/news/nasal-vaccine-against-covid-19-prevents-infection-in-mice/
link to the study: https://www.sciencedirect.com/science/article/pii/S0092867420310680
August 19, 2020
Timing of symptoms can help differentiate COVID-19 from other respiratory illnesses
Researchers at the USC Michelson Center for Convergent Bioscience analyzed thousands of COVID-19 cases and figured out the likeliest order of COVID-19 symptoms. According to the study published in the medical journal Frontier Public Health, the most likely order of symptoms is as follows: fever, followed by cough, followed by muscle pain, followed by nausea and vomiting, and then diarrhea. The researchers analyzed data sets for more than 55,000 COVID-19 cases in China that were collected in mid-February by the World Health Organization, as well as data from nearly 1,100 cases from December 11 to January 29 collected by China Medical Treatment Expert Group. Comparing the progression of symptoms in COVID-19 patients with influenza, SARS (severe acute respiratory syndrome), and MERS (Middle East respiratory syndrome), the researchers found that the presenting order of symptoms can help differentiate COVID-19 from the other respiratory illnesses. COVID-19 is most likely first heralded with fever and then cough, as opposed to influenza whose first symptom is most likely cough followed by fever. In COVID-19, upper gastrointestinal tract symptoms of nausea and vomiting most likely precede diarrhea, differentiating it from both SARS and MERS, in which diarrhea most likely precedes nausea and vomiting. The analysis also suggested that if diarrhea was a presenting symptom of COVID-19, the patient may experience a more severe case. This information may be useful to healthcare workers to help distinguish COVID-19 patients from others. Patients who are educated about the progression of COVID-19 symptoms may seek medical care earlier than they might have otherwise and can quarantine earlier to avoid spreading the disease.
August 10, 2020
Number of newly identified cancer cases decreased by 46.4% during the pandemic
In a research letter published in JAMA network August 4, 2020, analysis of the number of new cancer diagnoses fell 46.4% during the pandemic period from March 1 to April 18, 2020, compared to baseline historical data. The study included patients across the US who received testing for any cause by Quest Diagnostics in which the ordering physician assigned an ICD–10 code associated with any of the six types of common cancers (breast, colorectal, lung, pancreatic, gastric, and esophageal). Most of the decrease in new cancer diagnoses was in breast and colorectal cancers, which are diagnoses most often made by screening. Results mirror findings from other countries, which have also seen as much of as a 40% decline in weekly cancer incidence and a 75% decline in referrals for suspected cancer since COVID-19 restrictions were implemented. The letter makes the point that cancer does not take a pause, and the delay in diagnosis will likely lead to presentationof the cancers at more advanced stages with possibly poorer clinical outcomes. The article referenced a study that suggested a potential increase of 33,890 excessive cancer deaths in the United States and call for urgent planning to address the consequences of the delayed diagnoses.
August 4, 2020
Prior exposure to the coronaviruses that cause the common cold may affect the severity of SARS-CoV-2 symptoms
An article in Science Magazine online July 29, 2020, reported on a study published as a preprint in the journal Nature which showed that healthy individuals possessed immune cells capable of recognizing novel coronavirus SARS-CoV-2. Researchers suggested this cross-reactivity is due to prior exposure to "common cold" coronaviruses and may play a part in the spectrum of symptom severity in the pandemic. Helper T cells of healthy individuals with no known exposure to COVID-19 were exposed to fragments of the spike of protein of SARS-CoV-2. In 35% of healthy individuals, memory helper T cells were capable recognizing the fragments of SARS-CoV-2. The article discusses general information on the body's immune response, implications of the study results, and future plans by the researchers to further study how range of immunological factors correlate with symptoms.
link to Nature: https://www.nature.com/articles/s41586-020-2598-9
July 30, 2020
Rapid decay of anti-SARS-CoV-2 antibodies
In a correspondence published inThe New England Journal of Medicine, researchers from the David Geffen School of Medicine at the University of California reported on a small study done on 31 participants who recovered from mild COVID-19 and had their antibody levels to the SARS CoV-2 virus quantified. Measurements showed a rapid decay of anti-SARS-CoV-2 antibodies. The authors noted that a recent study had suggested a rapid decay of these antibodies but the rate was not described in detail. In the current study, the first antibody level was obtained at 37 days after the onset of symptoms (range, 18 to 65) and last measurement was obtained 86 days after the onset of symptoms (range, 44 to 119). The mean decrease in the level of antibodies suggested a half-life of approximately 36 days over the observation period. The authors concluded that the early antibody decay after acute viral exposures raises the concern that humoral immunity against SARS-CoV-2 may not be long-lasting in persons with mild illness. They raised concerns regarding antibody-based immunity passports, herd immunity, and perhaps vaccine durability in light of their findings and what is already known about common human coronaviruses.
July 29, 2020
FDA warns consumers and health care professionals not to use certain alcohol-based hand sanitizers
In a press release, July 27, 2020, the US Food and Drug Administration (FDA) reiterated its warning not to use certain hand sanitizers containing methanol. There have been an increasing number of adverse events including blindness, cardiac effects, effects on the central nervous system, and hospitalizations and deaths. The news release also reported the FDA's latest enforcement efforts to prevent certain hand sanitizers from entering the country. The FDA stresses that consumers must be vigilant about which hand sanitizers they use and urges consumers to immediately stop using all hand sanitizers on the FDA's list of dangerous hand sanitizer products. Methanol, commonly known as wood alcohol, is a dangerous substance. Exposure can result in nausea, vomiting, headache, blurred vision, permanent blindness, seizures, coma, permanent damage to the nervous system, or death. People using these products on their hands are at risk for methanol poisoning; however, young children who ingest these products or adolescents and adults who drink these products as an alcohol substitute are at most risk.
July 23, 2020
Making the case for aerosol transmission of SARS-CoV-2
Making the case that SARS-CoV-2 can be transmitted by aerosols, Kimberly Prather, Chair of Atmospheric Chemistry at the Scripps Institute of Oceanography, University of California San Diego, and colleagues authored an article published in Science that explained the science and reasoning why aerosol transmission can and does occur. Dr. Prather notes that, given how little is known about the production and airborne behavior of infectious respiratory droplets, it is difficult to define a safe distance for social distancing. She states that assuming the SARS-CoV-2 virions (the complete, infective form of a virus) are contained in submicron aerosols, as is the case for influenza viruses, a good comparison is exhaled cigarette smoke, which also contains submicron particles and will likely follow comparable flows and dilution patterns. “The distance from a smoker at which one smells cigarette smoke indicates the distance in those surroundings at which one could inhale infectious aerosols.” She believes masks are effective and that it is important to wear a properly fitted mask indoors even when 6 feet apart.
July 20, 2020
Transmission of SARS-CoV-2: A brief by the World Health Organization
The World Health Organization published a scientific brief, July 9, 2020, updating the current knowledge concerning COVID-19 transmission. The brief was undertaken by World Health Organization and their partners to consolidate information from reviews and publications in peer-reviewed journals and non peer-reviewed manuscripts in preprint servers. The document discusses the different modes in which the virus may be transmitted and when people infected with SARS-CoV-2 can infect others. The brief also explores the question of whether asymptomatic or pre-symptomatic transmission occurs. The World Health Organization brief underscores that understanding how the infection is spread, and when and in which settings the virus is transmitted, have important implications for strategies in preventing the disease.
July 17, 2020
Maternal-fetal transmission of SARS-CoV-2 infection
Some cases of transmission of SARS-CoV-2 infection to a newborn have been described, but it is unclear whether the infection was transmitted before or during birth or was caused by environmental exposure after birth. In the July 14, 2020, issue of Nature Communications, researchers shared a report of a newborn becoming infected with the SARS-CoV-2 virus through the placenta. Doctors examined the placenta and confirmed that the tissue contained high levels of the SARS-CoV-2 virus. The newborn had symptoms of brain injury that were similar to those of older patients with COVID-19.
July 15, 2020
Italian study finds 81.9% of individuals aged 20 years or younger have no symptoms following infection with the coronavirus
Age-specific estimates on the probability of developing symptoms upon infection with SARS-CoV-2 are sparse. Strategies for controlling the spread of the infection that rely on testing close contacts of individuals with the infection and isolating those who test positive are hampered by asymptomatic infections, which are easily missed by surveillance teams. Of particular relevance is transmission of infection by children given they are much less likely to experience symptoms. In a study done in Lombardy, Italy, clinical observations were made of the close contacts of 64,252 people with laboratory-confirmed SARS-CoV-2 infection. In the study, a cluster of 3,420 infected individuals were identified where all close contacts were tested for COVID-19 either by nasal swabs or serological testing, yielding overall sample size of 5,484 close contacts. Among the selected 5,484 close contacts, 51.5% or 2,824 tested positive. Of the 2,824 confirmed SARS-CoV-2 infections, 876 or 31% were symptomatic. Symptomatic cases were defined as showing upper or lower respiratory tract symptoms (eg, cough, shortness of breath) or fever ≥ 37.5 °C. The data were stratified by age, and researchers found that the probability of developing symptoms increased with age:
The authors noted that the contribution of asymptomatic infections to transmission of SARS-CoV-2 is poorly quantified and the estimates of the proportion of SARS-CoV-2 infections which are asymptomatic range from 17 to 87%, depending on what symptoms were included in the definition and when they were ascertained. This study shows that the likelihood of experiencing symptoms of SARS-Cov-2 infection increases with age. This study represents a useful piece of information that may lead us to better understand the role of children and young adults in the epidemiology of COVID-19. This preliminary study does not yet appear in a peer-reviewed journal, but its authors have made their findings available online, on the preprint platform arXiv.
July 14, 2020
A large proportion of COVID-19 patients had persistent symptoms after recovery from acute infection
A study done by Italian researchers and published in in the Journal of the American Medical Association found that a large number of COVID-19 patients had lingering symptoms. The study included 143 patients who were discharged from the hospital after recovery from COVID-19. All patients had met criteria for discontinuation of quarantine (no fever for 3 consecutive days, improvement in other symptoms, and 2 negative tests results for COVID-19, 24 hours apart). Patients enrolled in the study an average 36 days after discharge and had another negative PCR test for COVID-19 at the time of enrollment. The majority of patients reported fatigue and shortness of breath as persisting symptoms. At the time of evaluation, only 12.6% were completely free of any COVID-19 related symptoms, while 30% had one or two symptoms, and 55% had three or more symptoms. None the patients had a fever or any signs of acute illness. Worse quality-of-life was observed among 44.1% patients. A high proportion of individuals reported fatigue (53.1%), dyspnea (43.4%), joint pain (27.3%), and chest pain (21.7%). The researchers point out that while much attention has been focused on the acute phase of COVID-19, continued monitoring after discharge for long-lasting effects is needed. The authors note that the study has limitations, including being a single-center study, and information about symptoms the patient had prior to the infection were not available. Furthermore, there was no control group for comparison.
July 2, 2020
CDC says pregnant women at greater risk for severe COVID-19
According to a new report published online in the Morbidity and Mortality Weekly Report (MMWR) on June 26, 2020, pregnant women may be at increased risk for severe COVID-19 illness. In women of reproductive age (15 to 44 years) who were infected with SARS-CoV-2 (the virus that causes COVID-19), pregnancy was associated with a greater likelihood of hospitalization, admission to the intensive care unit, and needing mechanical ventilation. However, pregnancy was not associated with increased risk of death. There were 8207 cases of pregnant women who tested positive for COVID-19 reported to the CDC as of June 7. These women were compared with the 83,205 women of reproductive age who were known not to be pregnant and who tested positive for COVID-19. There was a substantially greater proportion of hospital admissions among pregnant women (31.5%) compared with non-pregnant women (5.8%). ICU admissions were reported for 1.5% of pregnant women compared with 0.9% of their non-pregnant counterparts, and mechanical ventilation was required for 0.5% of pregnant women compared with 0.3% of their non-pregnant counterparts. Hispanic and African-American women appear more likely to be infected by SARS-CoV-2 during pregnancy. The authors point out that during pregnancy women experience physiologic and immunologic changes that could increase the risk for more severe illness resulting from respiratory infections. Although the study has several limitations, the authors of this CDC report state that “…pregnant women should be made aware of their potential risk for severe illness from COVID-19. Pregnant women and their families should take measures to ensure their health and prevent the spread of SARS-CoV-2 infection. Specific actions pregnant women can take include not skipping prenatal care appointments, limiting interactions with other people as much as possible, taking precautions to prevent getting COVID-19 when interacting with others, having at least a 30-day supply of medicines, and talking to their health care provider about how to stay healthy during the COVID-19 pandemic. To reduce severe outcomes from COVID-19 among pregnant women, measures to prevent SARS-CoV-2 infection should be emphasized, and potential barriers to the ability to adhere to these measures need to be addressed.”
June 29, 2020
The reduction in daily CO2 emissions during the COVID-19 confinement
The amount of carbon dioxide (CO2) being released by human activity each day fell as much as 17% during the height of the coronavirus crisis in early April according to a study published on May 17, 2020 in the journal Nature Climate Change. Government policies of confinement (quarantine or stay at home) to reduce transmission of the virus during the COVID-19 pandemic have drastically altered patterns of energy demand around the world. Daily emissions temporarily fell to levels last seen in 2006. The analysis was carried out by an international team of researchers working on a future Earth's global carbon project, an initiative to trace the impacts of human-generated greenhouse gases on the planet. The 17% decline in CO2 emissions came in early April when confinement measures around the world were at the peak. The overall impact on 2020 annual emissions depends on the duration of the confinement with a low estimate of a decrease of about 4% if pre-pandemic conditions return by June and high estimate of a decrease of about 7% if some restrictions remain worldwide until the end the 2020. The authors point out that the annual decrease of CO2 emissions of between 4.2 to 7.5% is comparable to the rate of decrease needed year on year over the next decade to limit climate change to 1.5°C, highlighting the challenge faced to limit climate change in line with the Paris climate agreement.
June 23, 2020
Blood type is associated with severity of COVID-19
A study published in the New England Journal of Medicine on June 17, 2020, reported on a genetic analysis of more than 1900 severely ill patients from Spain and Italy who had respiratory failure due to COVID-19. These severely ill patients were compared to over 2000 patients who were healthy, some of whom may have had COVID-19 but had only mild or no symptoms. Previous studies have suggested that a person’s blood type might influence COVID-19 susceptibility. Researchers identified a gene location that was common in many of the patients with respiratory failure due to COVID-19. This gene also overlaps with a gene that controls blood type. Further study found that people with type A blood had a significantly higher risk of respiratory failure due to COVID-19 compared to people with other blood types. Type O blood was protective. The findings do not indicate how blood types are related to respiratory failure in patients with COVID-19, but the findings do provide doctors with additional information to indicate which patients may be at higher risk of severe COVID-19.
June 18, 2020
Comorbidities increase death by a factor of 12 in COVID-19 cases
The June 15 early release issue of the US Centers for Disease Control, Morbidity and Mortality Weekly Report, describes demographic characteristics, underlying health conditions, symptoms, and outcomes among 1,320,488 laboratory-confirmed COVID-19 cases as of May 30, 2020. Overall, 184,673 (14%) patients were hospitalized, 29,837 (2%) were admitted to an intensive care unit (ICU), and 71,116 (5%) died. Among 287,320 (22%) of cases with data on individual underlying health conditions, the most common underlying health conditions were: cardiovascular disease 32%, diabetes 30%, and chronic lung disease 18%. Hospitalizations were 6 times higher and deaths 12 times higher among those with reported underlying conditions compared to those who reported no underlying conditions. The CDC feels that the findings highlight the need for continued community mitigation strategies, especially for the vulnerable populations.
June 17, 2020
Dexamethasone reduced deaths among patients with severe COVID-19
An Oxford University news release dated June 16, 2020, reported positive results of a clinical trial of 6425 patients with severe COVID-19. Patients were randomly assigned to receive either dexamethasone 6 mg once per day either by mouth or intravenous injection for 10 days (n = 2104)or usual care alone (n = 4321). Dexamethasone reduced the deaths by 1/3 in ventilated patients and by 1/5 in patients receiving oxygen only. Both results were highly statistically significant. Based on these results, one death would be prevented by treatment of 8 ventilated patients or about 25 patients requiring oxygen alone. There was no benefit among those patients who did not require respiratory support. In the news release, Peter Horby, Professor of Emerging Infectious Diseases in the Nuffield Department of Medicine, University of Oxford, and one of the chief investigators for the trial said “Dexamethasone is the first drug to show improved survival in COVID-19.”It is important to note that the full data from the study have not yet been published or subjected to peer review, but outside experts immediately embraced the results. Patrick Vallance, the U.K. government’s chief scientific adviser, called the result “tremendous news” and “a ground-breaking development in our fight against the disease.” Scott Gottlieb, a former commissioner of the U.S. Food and Drug Administration, called it “a very positive finding.”
June 12, 2020
Striking decline in emergency department visits during the early parts of the pandemic
The COVID-19 pandemic has had a significant impact on the number of visits to the emergency room in the United States. A report published by the CDC in the Morbidity and Mortality Weekly Report on June 3, 2020, showed there was a decline in emergency visits by 42% during the early COVID-19 pandemic. The mean number of visits per week during the time frame from March 29 to April 25, 2020, was 1.2 million. Over the comparable time frame the previous year, March 31 to April 27, 2019, there were 2.2 million visits per week. The proportion of infectious disease related visits, however, was four times higher during this time period. The decreases were especially pronounced for children and females, and also in the Northeast part of the country. Visits for many conditions, including abdominal pain and other digestive symptoms, nonspecific chest pain and acute myocardial infarction (heart attack), and high blood pressure decreased during the pandemic, raising the concern that some individuals may be delaying care for conditions that might result in additional mortality if left untreated.
link to the study: https://www.cdc.gov/mmwr/volumes/69/wr/mm6923e1.htm?s_cid=mm6923e1_w
June 10, 2020
COVID-19 deaths rates put in perspectives
The New York Times reviewed the numbers of deaths in 25 cities and regions around the world during their most devastating months of the outbreak, setting those figures against their normal mortality levels, and then compared the increases to other natural disasters in history.
Increase in deaths during peak month compared to normal years:
June 9, 2020
Dogs can detect COVID-19 by sniffing armpits, study claims
According to a study by French scientists and published in preprint June 5, 2020, on the bioRxiv server, dogs are able to detect the presence of COVID-19 by sniffing the axillary (underarm) sweat from infected patients. The researchers trained eight Belgian Malinois Shepherd dogs to identify people infected with the coronavirus from the odor samples taken from the armpits of more than 360 subjects. The samples were from healthy individuals and from those suffering from COVID-19. Overall, the dogs had a 95% success rate in identifying samples from COVID-19 patients. Dogs were familiarized with the odor of COVID-19 patients and trained to sit when they encountered it. The test involved each dog doing between 15 and 68 detections. Four dogs scored a hundred percent or a perfect score, while others achieved an accuracy rate of between 83 and 94%. On two occasions, the dogs indicated a positive result for samples that scientists had been told had come from healthy individuals not infected with the coronavirus. The researchers sent this information back to the relevant hospitals and the patients were retested, and the results this time came back positive for the virus.
The researchers chose underarm sweat because it is the most efficient in terms of chemicals in the body that evaporate into the air at room temperature and contains strong chemical signaling of disease. Also there is no detectable virus in the sweat which could possibly put the dog’s health at risk. This proof-of-concept study was based on the assumption that dogs, because of their advanced sense of smell, could be trained to discriminate COVID-19 positive people from negative ones by detecting certain specific metabolites produced by the SARS-Cov2 virus. Dogs' olfaction detection has proven to be effective in numerous situations. It is been used to detect explosives, drugs, and banknotes. It is also used in the early detection of human diseases and various cancers and to alert diabetic or epileptic people to hypoglycemia or imminent seizure. The authors hope to carry out a validation study and, if the sensitivity and specificity are high enough, then national authorities may use trained dogs to detect COVID-19 as a complementary method, specifically in settings where equipment or money are lacking to perform standard serology or RT-PCR testing.
link to the study: https://www.biorxiv.org/content/10.1101/2020.06.03.132134v1.full.pdf+html
June 8, 2020
About 1 in 3 adults use chemicals or disinfectants unsafely while trying to protect against COVID-19
There has been a sharp increase in calls to poison control centers regarding exposures to cleaners and disinfectants since the onset of the COVID-19 pandemic. To gain insight into this sharp increase and people's use, knowledge, and practices regarding these products, the Centers for Disease Control and Prevention (CDC) conducted an opt-in internet panel survey of 502 U. S. adults in May 2020.
The results were published in the agency's Morbidity and Mortality Weekly Report on June 5, 2020. The survey found that approximately 39% of the respondents engaged in non-recommended high-risk practices such as using bleach on food products, applying household cleaning and disinfecting products to the skin, and intentionally inhaling or ingesting these products. Respondents who engaged in high-risk practices more frequently reported adverse health effects they believed were caused by their use. "These practices pose a risk of severe tissue damage and corrosive injury and should be strictly avoided," the authors wrote in the paper. They concluded, "Although adverse health effects reported by respondents could not be attributed to their engaging in high-risk practices, the association between these high-risk practices and reported health effects indicates a need for public health messaging regarding safe and effective cleaning practices aimed at preventing SARS-CoV-2 transmission in households."
June 4, 2020
First Human Trial of COVID-19 Antibody Drug
Eli Lilly, the Indianapolis-based pharmaceutical company, this week began the first human trial of a monoclonal antibody drug developed specifically against COVID-19. The medicine is a manufactured human antibody that duplicates an antibody found in the blood of a patient who recovered from Covid 19. The patient’s blood was screened using a new technology that identified more than 550 antibodies against the SARS-CoV-2 virus. Researchers then selected one that appeared particularly effective against the virus and began producing it in the laboratory. Antibody drugs must be given by vein but have the possibility of being able to help people recover from disease. They might also be used preventively in high-risk people exposed to disease before a vaccine is available.
link to the announcement:https://www.biopharmadive.com/news/eli-lilly-abcellera-coronavirus-antibody-drug-first-trial/57898
June 3, 2020
Timing of the COVID-19 test and the variability of false-negative results
In a study published in the Annals of Internal Medicine on May 13, 2020, researchers at Johns Hopkins University analyzed the results from seven previously published studies on the accuracy of the antibody test to determine whether a person has been exposed to the virus that causes COVID-19. Tests are not perfect. Results are sometimes normal in people who have the disease being tested for. That is, tests can have false-negative results. Results are sometimes abnormal in people who do not have the disease being tested for. That is, tests can have false-positive results.
Researchers found that the possibility of a false-negative result varied significantly with the timing of the test. Dates of testing ranged from the date of infection (the date of exposure), to the onset of symptoms (typically on day 5), and then dates after symptom onset. They discovered that the average probability of a false-negative result was 100% on the date of exposure, 67% on day 4, 38% on day of symptom onset, and 20% (lowest false-negative rate) on day 8 after exposure. After day 8, the probability of a false-negative result started to increase again. Therefore, the lowest false-negative rate was 8 days after exposure and 3 days after the typical onset of symptoms. The authors concluded that this may be the optimal time for testing if the goal is to minimize false-negative results.
link to the study:https://www.acpjournals.org/doi/10.7326/M20-1495
June 2, 2020
What sewage can tell us about the spread of COVID-19
Researchers have found large amounts of SARS-CoV-2 RNA, the genetic material for COVID-19, are excreted in the stool. Finding the viral signature of COVID-19 in sewage has allowed scientists to correlate the presence and amount of virus with disease spread and severity. Analysis of sewage can be a tool for disease surveillance and offers an easier way to gain a broader perspective of the pandemic without having to sample and test every person. In an article published in Smithsonian Magazine on May 14, 2020, Catherine J. Wu, a Boston-based science journalist and PhD in microbiology and immunology from Harvard University, discusses the recent research on how waste water can help track the spread of the COVID-19 virus, and the possible health implications of viral shedding in the feces, which then makes its way into the waste water system.
May 22, 2020
The airborne lifetime of small speech droplets and their potential importance in SARS-CoV-2 transmission
A study published on May 13, 2020, by the Proceedings of the National Academy of Sciences of the United States of America (PNAS) demonstrated that normal human speech emits droplets capable of lingering in the air. Researchers used lasers to emit an intense sheet of light to visualize bursts of speech droplets produced when subjects spoke the words "stay healthy." This light-scattering method provides visual evidence for speech droplet emission and also assesses their airborne lifetime. This method is particularly sensitive in measuring speech droplets with diameters less than 30 micrometers, which could remain airborne for longer than the larger droplets that have typically been the subject of research. They estimated that 1 minute of loud speaking generates at least 1000 virion-containing droplet nuclei that remain airborne for more than 8 minutes. Speech droplets generated by asymptomatic carriers are increasingly considered a likely mode of disease transmission. This direct visualization demonstrates how normal speech generates airborne droplets that can remain suspended for tens of minutes or longer and are eminently capable of transmitting disease in confined environments.However, it should be noted that this study does not address actual COVID-19 transmission.
link to the study: https://www.pnas.org/content/early/2020/05/12/2006874117
May 21, 2020
The CDC's advice for caring for someone sick at home
The Centers for Disease Control and Prevention (CDC) has recently published guidelines on caring for someone with COVID-19 at home or in a non-healthcare setting. The advice pertains to caring for people who are symptomatic with COVID-19 and for people who are asymptomatic but have tested positive. The recommendations are extensive and detailed. CDC provides helpful strategies on how to meet the basic needs of a person who is sick. CDC also identifies symptoms that may require emergency medical attention. CDC details ways caregivers can protect themselves.In the document, instructions can be found on how to limit contact with the sick person, how to handle meals, and when a sick person or caregiver is to wear face coverings or use gloves. Advice on handwashing, bathroom use, cleaning and disinfecting around the house, and doing the laundry is given. CDC also provides guidance on how to discontinue home isolation.
link to CDC guidance: https://www.cdc.gov/coronavirus/2019-ncov/if-you-are-sick/care-for-someone.html
May 19, 2020
COVID-19: Transmission explained
In a recent blog post, "The Risks-Know Them-Avoid Them," Erin S. Bromage, PhD, Associate Professor of Biology at the University of Massachusetts Dartmouth, explains the science of a contagious dose, where and how the virus spreads, and which environments are the riskiest. Dr. Bromage does an excellent job of translating data and findings into prose that non-scientists can more readily understand. Hopefully, a better understanding of how the COVID-19 virus spreads will help individuals make decisions about how to avoid becoming infected with the virus.
link to the blog post: https://www.erinbromage.com/post/the-risks-know-them-avoid-them
May 13, 2020
Pediatric multisystem inflammatory syndrome potentially associated withCOVID-19
Boston Children’s Hospital has published a brief overview of a recently reported pediatric syndrome that may be related to COVID-19. In recent weeks, reports have come in from Europe and the Eastern US of a small number of seriously ill children with an inflammatory illness that affects several organ systems (termed pediatric multisystem inflammatory syndrome). Reports are still fragmentary, and descriptions of symptoms vary, but patients seem to have fever, varying degrees of organ dysfunction, and multiple laboratory markers of severe inflammation. The syndrome sometimes progresses to significant shock, requiring drugs to control blood pressure and mechanical ventilation.
There seems to be a connection to the current COVID-19 pandemic in that a number of the affected children have a positive test for SARS CoV-2. However, the connection remains unclear.
The syndrome bears some relationship to Kawasaki disease; however, not all manifestations of Kawasaki disease are present.
Although rare, the cases are quite severe. Affected children do seem to respond to treatment, so potentially affected children should be referred to a specialty center.
link to the overview: https://discoveries.childrenshospital.org/covid-19-inflammatory-syndrome-children/
May 8, 2020
SARS-CoV-2 was already spreading in France in late December 2019
Reverse transcription polymerase chain reaction (RT-PCR) testing was done on a stored sputum sample of a patient hospitalized in France in late December with severe acute respiratory syndrome. RT-PCR is a technique that allows researchers to determine how much RNA from a specific source is in a sample. The sample was found to be positive for coronavirus. This result revealed that the epidemic in France started much earlier than originally believed. This finding was published online in the International Journal of Antimicrobial Agents on May 3, 2020. The researchers examined the medical records of all patients admitted to their ICU with influenza-like illness between December 2, 2019, and January 16, 2020 (a total of 124 patients). They excluded patients with a positive PCR test for another respiratory virus and excluded patients with medical records that indicated findings that were not typical of COVID-19. Nasopharyngeal samples of the remaining 12 patients were tested. One sample was positive for COVID-19. The positive sample belonged to a 42-year-old Algerian immigrant with no history of travel or link to China. He presented to the emergency department on December 27, 2019, with hemoptysis (coughing up blood), cough, chest pain, headache, and fever, that had been developing for 4 days. It is notable that one of his children had an influenza-like illness prior to the onset of his symptoms. The paper includes the medical history, clinical presentation, laboratory findings, radiological findings, and clinical course of his illness. Researchers concluded the disease was already spreading among the French population at the end of December 2019.
link to the study: https://www.sciencedirect.com/science/article/pii/S0924857920301643
May 7, 2020
Study of the transmission of SARS-CoV-2 in close contacts
An epidemiological study of COVID-19 in 391 cases and 1286 of their close contacts in Shenzhen, China published in The Lancet, provides information on the natural history and transmissibility of the SARS-CoV-2 virus. Using a large primary data set, researchers were able to shed light on the incubation times, time to recovery, and transmissibility of the virus. Interestingly, they found the secondary attack rate in close contacts to average around 7%. Transmission between very close contacts, such as individuals sharing a household, was less than one in six contacts (ie, secondary attack rate of 11 to 15%).
The study highlighted the finding that children were as likely to become infected as adults. Although children frequently do not get sick, they should not be overlooked as a significant source of transmission. The study also demonstrated the value of contact-based surveillance in reducing the spread of the SARS-CoV-2 virus in the community.
link to the study: https://www.thelancet.com/pdfs/journals/laninf/PIIS1473-3099(20)30287-5.pdf
May 5, 2020
Large-vessel strokes in young and middle-aged patients with COVID-19
The New England Journal of Medicine reported on April 28, 2020, on five cases of large-vessel stroke in patients 50 years of age or younger infected with COVID-19. The youngest was a 33-year-old woman.The report included allstroke patients younger than 50 at the Mount Sinai health system in New York City during a two-week period in late March and early April. The rate was nearly seven times the number of stroke patients in that age group during any average two-week period over the previous year and indicates a very strong correlation with COVID-19.
link to the news article: https://www.washingtonpost.com/health/2020/04/24/strokes-coronavirus-young-patients/
April 29, 2020
Yale University School of Public Health finds saliva samples promising alternative to nasopharyngeal swab
Yale University School of Public Health conducted a study comparing saliva and nasopharyngeal samples in 44 patients hospitalized with COVID-19 and 98 health care workers with occupational exposure to COVID-19 patients.The study was reported by Michael Greenwood on April 24, 2020, in Yale News. Although the study was small and limited, it showed great promise for using saliva samples in place of the current standard of using nasopharyngeal swabs.The study found that saliva yielded greater detection sensitivity and consistency throughout the course of infection when compared with patient-matched nasopharyngeal samples.There was also less variability in self-sample collection.This can be transformative in testing for COVID-19. Saliva testing is noninvasive, does not rely on nasopharyngeal swabs, and can be easily self-administered and therefore negates the risks, bottlenecks, and use of resources such as swabs and personal protective equipment (PPE), that direct patient contact and current testing practices use. The study has not been subject to peer review. The research results are currently available on the pre-print server medRxiv.
link to the study: https://www.medrxiv.org/content/10.1101/2020.04.16.20067835v1.full.pdf+html
April 28, 2020
WHO issues guidance on "immunity passports"
The World Health Organization (WHO) issued a brief warning (April 24, 2020) that there is no evidence that the presence of antibodies to the SARS-CoV-2 virus protects against reinfection and development of COVID-19 disease. The WHO cautions governments against using antibody testing to guide them on relaxing social measures and issuing “immunity passports” or “risk free certificates” that enable individuals to assume they are protected against re-infection. There are no guarantees that individuals who have had COVID-19, or have tested positive for antibodies, can return to work or travel risk-free. “At this point in the pandemic, there is not enough evidence about the effectiveness of antibody-mediated immunity to guarantee the accuracy of an 'immunity passport' or 'risk-free certificate,’ ” WHO said.
The WHO also emphasized that laboratory tests that detect antibodies to SARS-CoV-2 in people, including rapid immunodiagnostic tests, need further validation to determine their accuracy and reliability. Immunodiagnostic tests may falsely categorize people in two ways. The first is that they may falsely label people who have been infected as negative (false-negative) and the second is that people who have not been infected are falsely labelled as positive (false-positive). Each antibody test will need to have its accuracy (false-negative and false-positive rates) determined. Both errors have serious consequences and will affect control efforts.
link to the WHO announcement: https://www.who.int/news-room/commentaries/detail/immunity-passports-in-the-context-of-covid-19
April 27, 2020
Characteristics of patients hospitalized with COVID-19
A large case series of 5700 sequential patients admitted to New York City area hospitals between March 1 and April 4, 2020 with confirmed COVID-19 was published in JAMA Network online April 22, 2020. The study provides a comprehensive description of their presenting characteristics, comorbidities, and outcomes. Most notable is that many patients also had other medical problems such as high blood pressure (57%), obesity (42%) and diabetes (34%). At triage, only 31% had a fever. The study focused on the 2643 patients who were either discharged (2090) or died (553) during the study period. In this group of patients who reached these outcomes, 320 had received mechanical ventilation of whom 88% died, of those over age 65 who received mechanical ventilation 97% died. It should be noted that 3066 patients remained hospitalized at the time the outcome data was collected, and this certainly includes a number of patients over the age of 65 who required mechanical ventilation and had survived to that time.
link to the study: https://jamanetwork.com/journals/jama/fullarticle/2765184
April 24, 2020
Studies of hydroxychloroquine for COVID-19
The initial enthusiasm and early embrace of hydroxychloroquine has been tempered by concerns about efficacy and potential adverse effects. Several recent studies and reports are summarized (and mentioned below) in an April 21st online review article in Science (1), which highlights reasons for these concerns:
An analysis of the outcomes for 368 veterans hospitalized for COVID-19 and treated with hydroxychloroquine alone, hydroxychloroquine plus azithromycin, or no hydroxychloroquine was published on April 21 (2). This study showed no benefit in terms of reduced mortality or need for mechanical ventilation in the groups receiving hydroxychloroquine alone or in combination with azithromycin. The group receiving only hydroxychloroquine had an increase in death from all causes.
A Mayo Clinic Proceedings publication (3) on April 7 discussed the heart complications caused by chloroquine and hydroxychloroquine and provided guidance for doctors on monitoring for and avoiding this potentially lethal complication. The authors list risk factors for this complication and recommend screening for these factors before treatment, correcting risk factors that can be modified, and monitoring the patient’s heart during treatment.
A study at the New York University School of Medicine (4) looked at changes in the heart in 84 adult patients with SARS-CoV-2 infection treated with hydroxychloroquine plus azithromycin. In 11% of patients, significant heart changes occurred, representing a high risk for abnormal heart rhythms (arrhythmias).
In Brazil, a blinded, randomized clinical trial (5) of high- and low-dose chloroquine (given with ceftriaxone and azithromycin) in people hospitalized for COVID-19 was halted early after only 81 patients were enrolled when investigators found more deaths in the group getting the higher of the two doses of chloroquine.
1. Servick K: Antimalarials widely used against COVID-19 heighten risk of cardiac arrest. How can doctors minimize the danger? Science April 21, 2020. https://www.sciencemag.org/news/2020/04/antimalarials-widely-used-against-covid-19-heighten-risk-cardiac-arrest-how-can-doctors
2. Magagnoli J, Siddharth N, Pereira F, et al: Outcomes of hydroxychloroquine usage in United States veterans hospitalized with Covid-19. April 23, 2020. PREPRINT medRxiv available at https://www.medrxiv.org/content/10.1101/2020.04.16.20065920v2. doi: https://doi.org/10.1101/2020.04.16.20065920
3. Giudicessi JR, Noseworthy PA, Friedman PA, et al: Urgent Guidance for Navigating and Circumventing the QTc-Prolonging and Torsadogenic Potential of Possible Pharmacotherapies for Coronavirus Disease 19 (COVID-19). Mayo Clin Proc 2020 Apr 7 doi: 10.1016/j.mayocp.2020.03.024 [Epub ahead of print]
4. Chorin E, Dai M, Schulman E, et al: The QT interval in patients with SARS-CoV-2 infection treated with hydroxychloroquine/azithromycin. April 3, 2020. PREPRINT medRxiv available at https://www.medrxiv.org/content/10.1101/2020.04.02.20047050v1. doi: https://doi.org/10.1101/2020.04.02.20047050
5. Silva Borba MG, de Almeida Val F, Sampaio VS, et al: Chloroquine diphosphate in two different dosages as adjunctive therapy of hospitalized patients with severe respiratory syndrome in the context of coronavirus (SARS-CoV-2) infection: Preliminary safety results of a randomized, double-blinded, phase IIb clinical trial (CloroCovid-19 Study). April 16, 2020. PREPRINT medRxiv available at https://www.medrxiv.org/content/10.1101/2020.04.07.20056424v2 https://doi.org/10.1101/2020.04.07.20056424
April 23, 2020
Proposed national COVID-19 testing action plan
The Rockefeller Foundation has provided a comprehensive plan (dated 4/21/2020-see link below) to reopen workplaces and communities based on testing for COVID-19 and close follow-up of positive test results. The goal of the plan is to build a state-led national program of COVID-19 testing that supports reopening the economy through the goals of workforce monitoring, early detection of recurrent outbreaks, and diagnostic and home testing. The plan has 3 major components:
This white-paper provided by the Rockefeller Foundation has many good ideas and is a must read. The massive plan will require integration of many scattered computerized data platforms. All this will need to balance privacy with the need for infection control.
April 21, 2020
28,000 missing deaths: tracking the true toll of the coronavirus crisis
A review of mortality data in 11 countries showing that far more people died in these countries than in previous years was reported by Jin Wu and Allison McCann in the New York Times on April 21, 2020. They estimated the excess mortality for each country by comparing the number of people who died from all causes this year with the historical average during the same period. The finding was that at least 28,000 more people have died during the coronavirus pandemic over the last month than the official COVID-19 death counts report. Since most countries report only those COVID-19 deaths that occur in hospitals there are many COVID-19 deaths that are unreported. The 28,000 excess deaths found in this study include deaths from COVID-19 as well as those from other causes, likely including people with other disorders who were not treated as hospitals became overwhelmed. This article suggests that the overall global death toll from COVID-19 will be much higher than the reports of deaths due to COVID-19 confirmed by testing. For impressive graphic presentation of these trends in each country please use the following link to the article.
link to the news article: https://www.nytimes.com/interactive/2020/04/21/world/coronavirus-missing-deaths.html?smid=em-share
April 16, 2020
Serosurvey by NIH requesting volunteers
To get a clearer picture of the magnitude of the COVID-19 pandemic in the United States, the NIH is enrolling as many as 10,000 volunteers. Individuals with a confirmed history of COVID-19 or current symptoms of COVID-19 are not eligible to participate. “This study will…tell us how many people in different communities have been infected without knowing it, because they had a very mild, undocumented illness or did not access testing while they were sick,” said Anthony S. Fauci, MD, NIAID Director. Researchers will collect and analyze blood samples for antibodies to Sar-CoV-2 S protein. Results will help illuminate the extent to which the virus has spread undetected in the population. Participants will be shipped at-home blood collection kits and provided detailed instructions on collecting a microsample of blood and mailing it back for analysis. People interested in joining the study should contact:firstname.lastname@example.org
April 15, 2020
Prominent scientists have bad news about coronavirus antibody tests
In response to infection, our bodies make antibodies to fight the infection. Antibody tests measure the presence of these antibodies, identifying a person who has been infected. However, although a positive test means a person has been infected, it may not necessarily mean the infection has been cleared from the body and if cleared, it may not guarantee protection against a repeat infection. Also, there are a number of different antibody tests, each varying in accuracy.
An article in CNN on April 15, 2020 reported that top scientists have briefed White House officials about problems identified with the antibody tests being developed for COVID-19. Elizabeth Cohen, a Senior Medical Correspondent for CNN, identified several issues with development of antibody tests in the US.
First, the FDA relaxed the rules so that companies can sell their antibody tests without showing how well they work. The American Public Health Lab Association says this has resulted in “crappy” tests flooding the market. There is concern that some tests may identify antibodies to the different coronaviruses that cause the common cold, thus giving false-positive test results for COVID-19.
Second, without careful regulation, good antibody tests cannot be distinguished from bad ones.
Third is the question as to what antibody level provides protection against getting infected again with COVID-19 and perhaps spreading the virus to others. Much study will be needed to answer this question, which has important implications for our society and economy.
Fortunately, it has been reported that FDA Commissioner Dr. Stephen Hahn said antibody tests would undergo scientific review.
April 14, 2020
Why coronavirus death rates can't be summed up in one simple number
Johnathan Fuller, MD, PHD, provides a clear article in which he explains the wider perspective on the ever-shifting COVID-19 statistics. In an April 10, 2020, article in the on-line journal, The Conversation, Dr. Fuller explains why statistics and models differ. His scholarship provides the reader with a framework and perspective to help interpret the large volume of epidemiological information being reported about the COVID-19 pandemic. Making the best decisions on public health policy and individual cases requires deeper understanding of the models than just the numbers alone.
link to the article: Why coronavirus death rates cant be summed up in one simple number
April 10, 2020
Can smart phone apps help beat pandemics?
An interesting article was posted April 9, 2020 by Dr, Francis Collins, Director of the National Institutes of Health (NIH). On the NIH Director's Blog, he discusses enlisting the use of smart phones for contact tracing and notification in fighting the COVID-19 pandemic. Traditional methods involving teams of public health workers speaking to people via phone or in face-to-face meetings is very time consuming. Lost time allows for infection to spread more widely because there is a delay in finding and notifying individuals exposed to the virus. By taking advantage of smart phones' wireless Bluetooth technology, digital tracing can improve the chances of keeping COVID-19 under control. In China, research showed a correlation between the use of contact-tracing apps and what appears to be sustained suppression of COVID-19 infection. Dr. Collins touches on major ethical, legal, and social issues.
link to the blog post: https://directorsblog.nih.gov/author/collinsfs/
April 9, 2020
A new drug called EIDD-2801 shows promise in treating lung damage caused by the novel coronavirus Sars-CoV -2. EIDD-2801, a ribonucleoside analog with antiviral activity on the RNA-dependent RNA polymerase, was developed by researchers at UNC-Chapel Hill Gillings School of Global Public Health. Results from the most recent study were published April 6, 2020 online by the journal Science Translational Medicine. The published study found EIDD-2801 can protect cultured human lung cells infected with SARS-Cov-2. The drug also appears effective in treating other serious coronavirus infections. Experiments with mice found when EIDD-2801 is given 12 to 24 hours after onset of infection with viruses related to COVID-19 lung damage and weight loss were significantly reduced. An added advantage is that the drug can be given orally as opposed to other treatments that must be given intravenously. The ease of treatment offers the potential for treating less ill patients, or for prophylaxis.
link to the study: https://stm.sciencemag.org/content/early/2020/04/03/scitranslmed.abb5883
April 8, 2020
Interesting news from a story published in ScienceDaily
Scientists at the University of Pittsburgh School of Medicine announced a potential vaccine against COVID-19. The vaccine when tested in mice produced antibodies specific to Sars-CoV-2 at quantities sufficient for neutralizing the virus. The paper detailing the research appeared April 2, 2020 in EBioMedicine, which is published by Lancet. Using groundwork laid during earlier coronavirus epidemics, the vaccine targets the spike protein of the coronavirus. The vaccine is produced using lab-made pieces of viral protein to build immunity. It's the same way the current flu shots work. Researchers use a novel approach to deliver the drug, called a microneedle array, to increase potency. The co-senior author of the study stated that "testing in patients would typically require at least a year and probably longer."
link to the news article: https://www.sciencedaily.com/releases/2020/04/200402144508.htm
April 6, 2020
A small trial looking at the drug hydroxychloroquine, in combination with azithromycin on patients with severe symptoms found no evidence of strong antiviral activity or clinical benefit from the combination of drugs. There were only eleven patients in the study, eight of the patients had underlying conditions that placed them at poor risk. This trial is too small to allow meaningful statistical analysis or conclusions regarding efficacy or safety of the drugs. However, this report cast doubts about the antiviral efficacy of this combination in patients severely ill with COVID-19 as had been suggested by an earlier French study.
April 6, 2020
A significant portion of people who are infected with coronavirus lack symptoms and even those who eventually develop symptoms can transmit the virus to others before showing symptoms. This means that the virus can spread between people interacting in close proximity—for example, speaking, coughing, or sneezing—even if those people are not exhibiting symptoms. In light of this, the CDC recommends wearing cloth face coverings in public settings where other social distancing measures are difficult to maintain (e.g., grocery stores and pharmacies) especially in areas of significant community-based transmission. Use of simple cloth face coverings will slow the spread of the virus and help people who may have the virus and do not know it from transmitting it to others. Cloth face coverings fashioned from household items or made at home from common materials at low cost can be used as an additional, voluntary public health measure.
It is critical to emphasize that maintaining 6-feet social distancing remains important to slowing the spread of the virus.
The cloth face coverings recommended are not surgical masks or N-95 respirators. Those are critical supplies that must continue to be reserved for healthcare workers and other medical first responders, as recommended by current CDC guidance.
For the full CDC recommendations see: https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/cloth-face-cover.html