Snapshot A 2-month-old girl infant presents to the emergency room with a 3-day history of a cough and post-tussive emesis. Her mother reports that while she had the Tdap vaccine during pregnancy, the father did not. For the past 2 weeks, the father has had a persistent dry cough. The infant's temperature is 100.4°F (38°C), pulse is 160/min, and respirations are 60/min. Physical exam reveals an infant with a dry cough on expiration and a whooping sound on inspiration. Fine crackles are heard bilaterally on auscultation. She is admitted and given antibiotics. Introduction Classification login to view 4 more bullets Epidemiology login to view 9 more bullets Pathogenesis login to view 6 more bullets Associated conditions login to view 2 more bullets Prevention login to view 7 more bullets Prognosis login to view 1 more bullet Presentation Symptoms login to view 8 more bullets Physical exam login to view 6 more bullets Studies Labs login to view 6 more bullets Making the diagnosis login to view 1 more bullet Differential Mycoplasma pneumonia login to view 2 more bullets Complications Pneumonia Failure to thrive Death login to view 1 more bullet Apnea login to view 1 more bullet