On which of the following is the Lancefield classification based?
-
M protein
-
Carbohydrate C antigen
-
Cell-wall peptidoglycan
-
T protein
B
Correct answer
Explanation
B-hemolytic streptococci are classified on the basis of group-specific C carbohydrate antigen on cell wall into 20 lancefield groups (A To V except I and J).
Group A streptococci are further classified by serological typing of (M) proteins into Griffith types.