Virulence factors of Staphylococcus aureus include all of the following except one. Which one is the exception?: (A) Beta-lactamases, (B) Coagulase, (C) Enterotoxins, (D) M Protein
Answer is D. M proteins are virulence factors of group A Streptococci (Streptococcus pyogenes). All of the other listed virulence factors may be found routinely in S. aureus bacteria.