HY USMLE Q #595 – Micro

A 9-month-old girl is brought to the physician by her mother for a 2-day history of low-grade fever and mild wheezing. Physical examination shows bilateral wheezes on auscultation. Temperature is 101 F. Which of the following is the most likely explanation for these findings?

DNA virus
Gram-negative bacterium
Gram-positive bacterium
Helminth
RNA virus