The virulence and post-infection complication following infection with Streptococcus pyogenes is determined by which of the following factors:

The virulence and post-infection complication following infection with Streptococcus pyogenes is determined by which of the following factors:



A. The M protein
B. The M-like protein
C. The C-Carbohydrate antigen located in the cell wall D. The F protein
E. Patient's age and sex


Answer: A. The M protein


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