Maternal infections account for 2 to 4% of all clinically diagnosed S. pyogenes infections. The risk of sepsis is relatively high compared to other bacterial infections acquired during pregnancy, and S. pyogenes is a leading cause of septic shock and death in pregnant and postpartum women.

Bacteriology

Serotyping

In 1928, Rebecca Lancefield published a method for serotyping S. pyogenes based on its cell-wall

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