Quellung reaction is associated with -: (A) Capsular degeneration, (B) Capsular delineation, (C) Capsular absence, (D) Lecithinase production
Answer is B. Ans. is 'b' i.e., Capsular delineation A suspension of pneumococci is mixed on a slide with a drop of the type specific antiserum and methylene blue. On the presence of homologous antiserum capsule becomes apparently swollen, sharply delineated and refractile.