Multiple choice

On which of the following is the Lancefield classification based?

  1. M protein

  2. Carbohydrate C antigen

  3. Cell-wall peptidoglycan

  4. T protein

Reveal answer Fill a bubble to check yourself
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.