All are true about streptococcus Except
M-protein is responsible for production of mucoid colonies
M-protein is responsible for virulence
Mucoid colonies are virulent
Classified based on their haemolytic propeies.
Mucoid colonies are due to the production of the capsule of hyaluronic acid not due to M-protein. Growth characteristic of Strep. pyogenes: On blood agar, virulent stains form matt or mucoid colonies while avirulent from glossy colonies. M, T, R are proteins found on the outer pa of the cell wall and forms the basis of Griffith classification. M protein - acts as virulence factor and antibody against it is protective. T and R protein - No relation to virulence Ref : 208
All India exam