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

Streptococci and Some Disorders They Cause

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