Review Question - QID 212824

A 1-year-old girl is brought to the pediatric emergency room by her parents due to wheezing and trouble breathing. Her parents note that she has not been feeding well and has had a fever of 101°F (38.3°C) over the past few days along with a runny nose. On physical examination, the patient is found to have increased work of breathing marked by nasal flaring and intercostal retractions, along with bilateral wheezing. The patient’s chest radiograph is shown in Figure A. Which of the following pathogens is the most likely cause of this patient’s clinical presentation?