The usual incubation period of peusis is ?: (A) 7-14 days, (B) 3-5 days, (C) 21-25 days, (D) Less than 3 days
Answer is A. Ans. is 'a' i.e., 7-14 days Whooping cough (peussis) After an incubation period of about 1-2 weeks, the disease takes a protracted course comprising three stages-- the catarrhal, paroxysmal and convalescent - each lasting approximately two weeks.