A 3-month-old boy presented to the Emergency Room with a history of paroxysmal episodes of staccato cough, with inspiration between each cough. It is associated with perioral cyanosis and post-tussive vomiting. There is no history of diarrhea. This illness was preceded by conjunctivitis a few days ago. On examination, the child looks unwell and tachypneic with auscultatory crackles. He has a normal white blood cell count with elevated eosinophils on laboratory evaluation. Which of the following is the most likely diagnosis?
September 6, 2026 232 2
