Which stage of pertussis is characterized by paroxysmal coughing?

• A. Catarrhal stage
• B. Incubation period
• C. Convalescent stage
• D. Paroxysmal stage

Answer: (D)

Pertussis shows distinct clinical phases, each with its own pattern of symptoms. After an incubation period, the initial catarrhal phase features milder upper-respiratory signs, with a few days of cough that isn’t yet dramatic. The paroxysmal phase is where coughing comes in bursts—explosive, rapid paroxysms that can be so forceful they cause posttussive vomiting and may be followed by a sudden inspiration that produces a whoop. This profusion of paroxysms reflects the toxin-driven injury to the airways and the impaired clearing of secretions. The convalescent stage follows, with a gradual decrease in cough over weeks. So, the stage characterized by paroxysmal coughing is the paroxysmal stage.