[The content of M-substance as one of the indices of the virulence of streptococci of A group isolated during some streptococcal infections].
D006801:Humans; D009930:Organic Chemicals; D013290:Streptococcal Infections / Q000737:chemistry*; D013291:Streptococcus / Q000737:chemistry*; D014774:Virulence
D009930:Organic Chemicals; C028349:substance M
STREPTOCOCCAL INFECTIONS/chemistry; STREPTOCOCCUS/chemistry