Quellung reaction is seen in -: (A) Group B streptococcus, (B) Staphylococcus, (C) Pneumococcus, (D) Enterococcus
Answer is C. Ans. is 'c' i.e., Pneumococcus o 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.o This is called Quellung reaction.