The group G streptococcus (GGS) is a rare cause of deep soft-tissue in
fection. We report what we believe is the first case of acute diffuse
GGS myositis in association with toxic shock, Although the causative o
rganism did not contain the genes for group A streptococcal pyrogenic
exotoxins (SPEs) or make SPEs, the organism produced at least one new
toxin that shared the biologic properties of the SPEs.