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A previоusly heаlthy 5-mоnth-оld infаnt presents with а 3-day history of worsening cough and rhinorrhea, now has developed symptoms of respiratory distress with audible expiratory wheezes and increased coughing, temp to 100.9. The infant’s immunizations are up-to-date. The physical exam reveals a respiratory rate of 50 breaths per minute, coarse expiratory wheezing, and prolonged expiration. An oxygen saturation is 96% on room air. What is the most likely diagnosis for this infant?