The polysaccharide capsule of following bacteria has in role in their infectivity except: (A) Haemophilus influenza, (B) Neisseria meningitides, (C) Streptococcus pneumoniae, (D) Bordetella peussis
Answer is D. The polysaccharide capsule of Bordetella peusis has no significant role in its infectivity. Bordetella fresh cultures demonstrated capsules but its virulence is mainly toxin-mediated.