This 9-month-old boy was born prematurely, requiring treatment in a neonatal intensive care unit for the first month of life. After discharge, he remained well until 3 days ago, when symptoms of a common cold progressed to cough, rapid and labored respiration, lethargy, and refusal to eat. On examination, his temperature was 38.5°C, respiratory rate 60/min, and pulse 140/min. Auscultation of the chest revealed coarse crackles and occasional wheezes. Abnormal laboratory findings included hypoxemia and hypercapnia. A chest radiograph showed hyperinflation, interstitial perihilar infiltrates, and right upper lobe atalectasis.
Question 1 of 4:
1. Which of these viruses is the least likely cause of this baby’s illness?
A - Influenza
B - Parainfluenza
C - Reovirus
D - Respiratory synctial virus
E - Adenovirus
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