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 |