A 6-month-old infant from rural Uttar Pradesh presents with a 3-week history of paroxysmal cough with inspiratory stridor and post-tussive vomiting. Nasopharyngeal swab culture on Bordet–Gengou medium grows gram-negative coccobacilli. Regarding pertussis, all of the following are true EXCEPT:

See the options, answer & explanation

Sign in free to reveal the answer choices, the correct answer, the detailed explanation, and AI-powered insights for this question.