MSD 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

Skin

Wound infections

Other

Pleurisy

Scarlet fever (no longer common)

Disorders that develop after streptococcal infections

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

Viridans

Various species

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