Occurrence of the M. substance of type 28 group A in streptococci of Lancefield groups B, C and G.
D009930:Organic Chemicals; D013290:Streptococcal Infections / Q000208:ethnology*; D013291:Streptococcus / Q000208:ethnology*
D009930:Organic Chemicals; C028349:substance M
STREPTOCOCCI/culture