1.Etiology ◆β- hemolytic streptococcus, group A antigen components of cytoplasm membrane frequently CIC, sometimes 'planted antigen ◆ Others other bacteria ● viruses parasites1.Etiology ♦ -hemolytic streptococcus, group A • antigen – components of cytoplasm & membrane – frequently CIC, sometimes ‘planted antigen’ ♦ Others • other bacteria • viruses • parasites