<prompt> Incubation period of pertussis is7 days714 days1428 days28 days  <response>: Pertussis 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.B. pertussis infection Incubation period 1-2 weeks Catarrhal stage 1-2 weeks Paroxysmal stage 2-4 weeks Convalescent stage 1-2 weeks but may last 1 to 3 monthsRememberCatarrhal stage is the stage of maximum infectivity.Maximum complications occur in Paroxysmal stage. 