USMLE® Step 1 style questions USMLE
USMLE® Step 2 style questions USMLE
A 13-year-old boy comes to his pediatrician's office because of fevers and worsening cough for the past 4 days. His past medical history is significant for cystic fibrosis. A sputum culture is done which grows gram-negative rods which are oxidase positive, catalase positive, and do not ferment lactose. Which of the following is the most likely causative organism?