Beta-hemolysis of Group A streptococci (S.pyogenes) on agar plate with sheep blood
Beta and gamma-hemolysis on sheep blood agar. Beta-hemolytic streptococci of Group A (Streptococcus pyogenes) are surrounded by zones of complete hemolysis (beta-hemolysis). Cultivation 48 hours in an aerobic
Group A Streptococcus (S.pyogenes) is a bacterium often found in the throat and on the skin. People may carry group A streptococci in the throat or on the skin and have no symptoms of illness. Most GAS infections are relatively mild illnesses such as "strep throat", or impetigo. Occasionally these bacteria can cause severe and even life-threatening diseases.
Infection with GAS can result in a range of symptoms:
- No illness
- Mild illness (strep throat or a skin infection such as impetigo)
- Severe illness (necrotizing faciitis, streptococcal toxic shock syndrome)