Table: Streptococci and Some Disorders They Cause - Merck Manuals Consumer Version

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Streptococci and Some Disorders They Cause

Streptococci and Some Disorders They Cause

Species	Circumstances	Disorders
Group A
Streptococcus pyogenes	Ears, nose, and throat	Middle ear infection (otitis media) Sinusitis Sore throat (pharyngitis, called strep throat)
	Skin	Cellulitis (infection of tissues just under the skin) Erysipelas (a superficial form of cellulitis) Impetigo (a skin infection) Wound infections
	Other	Infection of heart valves (endocarditis) Necrotizing fasciitis Pleurisy Pneumonia Scarlet fever (no longer common) Streptococcal toxic shock syndrome
	Disorders that develop after streptococcal infections	Glomerulonephritis (kidney inflammation) Rheumatic fever
Group B
Streptococcus agalactiae	In adults, especially those with diabetes mellitus	Abscesses Cellulitis Wound infections Foot (and sometimes bone) infections due to diabetes
	In newborns	Bloodstream infections Meningitis Pneumonia
	In women after delivery of a baby	Bloodstream infections Infection of the uterus (endometritis)
Viridans
Various species	—	Dental cavities Meningitis Bloodstream infections Infection of heart valves (endocarditis) that have been damaged by a disorder such as a congenital heart disorder or rheumatic fever