<qa>  What is the name of the group A streptococcus infection?Group A streptococcus GAS causes a variety of human infections. It is also an uncommon but serious cause of postpartum infections. In contrast to group B streptococcus GBS infection, which causes illness and death in newborns disproportionately more often than it does in mothers, perinatal GAS infection primarily affects mothers . Invasive GAS infection is defined by the isolation of GAS from a normally sterile site e.g., blood or by the isolation of GAS from a nonsterile site in the presence of the streptococcal toxic shock syndrome or necrotizing fasciitis. A postpartum case of invasive GAS is defined as isolation of GAS during the postpartum period, in association with a clinical postpartum infection e.g., endometritis or from either a sterile site or a wound infection. 