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Lymphocytic Choriomeningitis

By

Thomas M. Yuill

, PhD, University of Wisconsin-Madison

Last full review/revision Aug 2021| Content last modified Aug 2021
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Lymphocytic choriomeningitis is caused by an arenavirus Overview of Arbovirus, Arenavirus, and Filovirus Infections Arbovirus (arthropod-borne virus) applies to any virus that is transmitted to humans and/or other vertebrates by certain species of blood-feeding arthropods, chiefly insects (flies and mosquitoes)... read more . It usually causes a flu-like illness or aseptic meningitis, sometimes with rash, arthritis, orchitis, parotitis, or encephalitis. Diagnosis is by viral isolation, polymerase chain reaction (PCR), or indirect immunofluorescence. Treatment is supportive.

Lymphocytic choriomeningitis virus is endemic in rodents. Human infection results most commonly from exposure to dust or food contaminated by the gray house mouse or hamsters, which harbor the virus and excrete it in urine, feces, semen, and nasal secretions. The percentage of infected house mice in a population may vary by geographic location; it is estimated that 5% of house mice throughout the US carry lymphocytic choriomeningitis virus and can transmit the virus throughout their life without showing any sign of illness. When transmitted by mice, the disease occurs primarily in adults during autumn and winter.

Symptoms and Signs of Lymphocytic Choriomeningitis

The incubation period for lymphocytic choriomeningitis is 1 to 2 weeks.

Most patients have no or minimal symptoms. Some develop a flu-like illness. Fever, usually 38.5 to 40° C, with rigors is accompanied by malaise, weakness, myalgia (especially lumbar), retro-orbital headache, photophobia, anorexia, nausea, and light-headedness. Sore throat and dysesthesia occur less often.

After 5 days to 3 weeks, patients may improve for 1 or 2 days. Many relapse with recurrent fever, headache, rashes, swelling of metacarpophalangeal and proximal interphalangeal joints, meningeal signs, orchitis, parotitis, or alopecia of the scalp.

Aseptic meningitis Meningitis is inflammation of the meninges and subarachnoid space. It may result from infections, other disorders, or reactions to drugs. Severity and acuity vary. Findings typically include... read more occurs in a minority of patients. Rarely, frank encephalitis, ascending paralysis, bulbar paralysis, transverse myelitis, or other neurologic symptoms can occur. Neurologic sequelae are rare in patients with meningitis but occur in up to 33% of patients with encephalitis.

Infection during pregnancy may cause fetal abnormalities, including hydrocephalus, chorioretinitis, and intellectual disability. Infections that occur during the 1st trimester may result in fetal death.

Diagnosis of Lymphocytic Choriomeningitis

  • Polymerase chain reaction (PCR), cerebrospinal fluid analysis, antibody detection, and viral culture

Lymphocytic choriomeningitis is suspected in patients with exposure to rodents and an acute illness, particularly aseptic meningitis or encephalitis. Aseptic meningitis may lower cerebrospinal fluid glucose mildly but occasionally to as low as 15 mg/dL (0.83 mmol/L). Cerebrospinal fluid white blood cell counts range from a few hundred to a few thousand cells, usually with > 80% lymphocytes. White blood cell counts of 2000 to 3000/mcL (2 to 3 x 109/L) and platelet counts of 50,000 to 100,000/mcL (50 to 100 x 109/L) typically occur during the first week of illness.

Diagnosis can be made by

  • PCR or by isolation of the virus from the blood or cerebrospinal fluid during the acute stage of illness

  • Indirect immunofluorescence assays of inoculated cell cultures, although these tests are most likely to be used in research laboratories

  • Tests that detect seroconversion of antibody to the virus

Treatment of Lymphocytic Choriomeningitis

  • Supportive care

Anti-inflammatory drugs (eg, corticosteroids) may be considered in certain circumstances.

Key Points

  • In humans, lymphocytic choriomeningitis is usually acquired via exposure to dust or consumption of food contaminated by mouse or hamster excreta.

  • Most patients have no or minimal symptoms, but some develop a flu-like illness, and a few develop aseptic meningitis.

  • Infection during pregnancy may cause fetal abnormalities; if infection occurs during the 1st trimester, the fetus may die.

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