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Pertussis in young infant — RCPSC EM MCQ

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ModeratePaediatric emergenciesPertussis in young infantRCPSC EM

A 5-week-old has paroxysmal coughing spells with cyanosis and post-tussive emesis. He is afebrile, unimmunised, and lymphocyte count is elevated. What is the most likely diagnosis?

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Correct answer: B — Pertussis

Paroxysmal cough, cyanosis, post-tussive emesis, young age and lymphocytosis suggest pertussis.

Reference: Canadian Paediatric Society pertussis guidance