Streptococcus pyogenes shows pathogenicity by all except?: (A) M protein, (B) Pyrotoxin, (C) Pili, (D) Streptolysin O
Answer is C. Ans. is 'c' i.e., Pili Virulence factors of str. pyogenes Str. pyogenes forms several exotoxins and enzymes which contribute to its virulence, but M protein is the most impoant of these.