Streptococcus pyogenes is a species of bacteria. Like most other streptococci, it is clinically important in human illness. It is an infrequent, but usually pathogenic, part of the skin flora.It is the sole species of Lancefield group A and is often called group A streptococcus (GAS), because it displays streptococcal group A antigen on its cell wall.Group A streptococcal infection can cause illness, which typically produces small zones of beta-hemolysis, a complete destruction of red blood cells.. pyogenes is the cause of many important human diseases, ranging from mild superficial skin infections to life-threatening systemic diseases. Infections typically begin in the throat or skin. The most striking sign is a strawberry-like rash.
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'I was scarred for life': Dax Shepard talks about his wife Kristen Bell's 'car crash' of a C-section. They just welcomed their second daughter. But Dax Shepard says he was scarred by wife Kristen Bell's 33-hour labor which ended in a C-section. During a taping for the Ellen DeGeneres Show the 40-year-old revealed details about the arrival of his now three week old daughter Delta. Scroll down for video