Merck Manual

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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)

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)

Pleurisy

Scarlet fever (no longer common)

Disorders that develop after streptococcal infections

Glomerulonephritis (kidney inflammation)

Group B

Streptococcus agalactiae

In adults, especially those with diabetes mellitus

Abscesses

Cellulitis

Wound infections

In newborns

In women after delivery of a baby

Bloodstream infections

Infection of the uterus (endometritis)

Viridans

Various species

Infection of heart valves (endocarditis) that have been damaged by a disorder such as a congenital heart disorder or rheumatic fever