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Species
Circumstances
Disorders
Group A
Streptococcus pyogenes
Ears, nose, and throat
Middle ear infection (otitis media Otitis Media (Acute) Acute otitis media is a bacterial or viral infection of the middle ear. Acute otitis media often occurs in people with a cold or allergies. The infected ear is painful. Doctors examine the eardrum... read more )
Sinusitis Sinusitis Sinusitis is inflammation of the sinuses, most commonly caused by a viral or bacterial infection or by an allergy. Some of the most common symptoms of sinusitis are pain, tenderness, nasal congestion... read more
Sore throat (pharyngitis Throat Infection Infections of the throat and/or tonsils are common, particularly among children. Throat infections are usually caused by a virus but may be caused by bacteria such as streptococcal bacteria... read more , called strep throat)
Skin
Cellulitis Cellulitis Cellulitis is a spreading bacterial infection of the skin and the tissues immediately beneath the skin. This infection is most often caused by streptococci or staphylococci. Redness, pain, and... read more (infection of tissues just under the skin)
Erysipelas Erysipelas Erysipelas is a superficial form of skin infection (cellulitis) typically caused by streptococci. (See also Overview of Bacterial Skin Infections.) Erysipelas is most commonly caused by Streptococcus... read more (a superficial form of cellulitis)
Impetigo Impetigo and Ecthyma Impetigo is a superficial skin infection, caused by Staphylococcus aureus, Streptococcus pyogenes, or both, that leads to the formation of scabby, yellow-crusted sores and, sometimes, small... read more (a skin infection)
Wound infections
Other
Infection of heart valves (endocarditis Infective Endocarditis Infective endocarditis is an infection of the lining of the heart (endocardium) and usually also of the heart valves. Infective endocarditis occurs when bacteria enter the bloodstream and travel... read more )
Necrotizing fasciitis Necrotizing Skin Infections Necrotizing skin infections, including necrotizing cellulitis and necrotizing fasciitis, are severe forms of cellulitis characterized by death of infected skin and tissues (necrosis). The infected... read more
Pleurisy
Pneumonia Overview of Pneumonia Pneumonia is an infection of the small air sacs of the lungs (alveoli) and the tissues around them. Pneumonia is one of the most common causes of death worldwide. Often, pneumonia is the final... read more
Scarlet fever (no longer common)
Streptococcal toxic shock syndrome Toxic Shock Syndrome Toxic shock syndrome is a group of rapidly progressive and severe symptoms that include fever, rash, dangerously low blood pressure, and failure of several organs. It is caused by toxins produced... read more
Disorders that develop after streptococcal infections
Glomerulonephritis Glomerulonephritis Glomerulonephritis is a disorder of glomeruli (clusters of microscopic blood vessels in the kidneys with small pores through which blood is filtered). It is characterized by body tissue swelling... read more (kidney inflammation)
Rheumatic fever Rheumatic Fever Rheumatic fever is inflammation of the joints, heart, skin, and nervous system, resulting from a complication of untreated streptococcal infection of the throat. This condition is a reaction... read more
Group B
Streptococcus agalactiae
In adults, especially those with diabetes mellitus
Abscesses
Cellulitis
Foot (and sometimes bone) infections Osteomyelitis Osteomyelitis is a bone infection usually caused by bacteria, mycobacteria, or fungi. Bacteria, mycobacteria, or fungi can infect bones by spreading through the bloodstream or, more often, by... read more due to diabetes Diabetes Mellitus (DM) Diabetes mellitus is a disorder in which the body does not produce enough or respond normally to insulin, causing blood sugar (glucose) levels to be abnormally high. Urination and thirst are... read more
In newborns
Bloodstream infections Sepsis in Newborns Sepsis is a serious bodywide reaction to infection spread through the blood. Newborns with sepsis appear generally ill—they are listless, do not feed well, often have a gray color, and may have... read more
Meningitis Bacterial Meningitis in Newborns Bacterial meningitis is inflammation of the layers of tissue surrounding the brain and spinal cord (meninges) caused by bacteria. Newborns with bacterial meningitis are usually irritable, vomit... read more
Pneumonia Pneumonia in Newborns Pneumonia is an infection of the small air sacs of the lungs (alveoli) and the tissues around them. This infection may be caused by bacteria, viruses, or fungi. Newborns have various symptoms... read more
In women after delivery of a baby
Bloodstream infections
Infection of the uterus (endometritis Postpartum Infections of the Uterus Infections that develop after delivery of a baby (postpartum infections) usually begin in the uterus. Bacteria can infect the uterus and surrounding areas soon after delivery. Such infections... read more )
Viridans
Various species
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Dental cavities Cavities Cavities are decayed areas in the teeth, the result of a process that gradually dissolves a tooth’s hard outer surface (enamel) and progresses toward the interior. (See also Overview of Tooth... read more
Infection of heart valves (endocarditis) that have been damaged by a disorder such as a congenital heart disorder or rheumatic fever
