22nd August 2023

A 9-month-old boy is brought to the GP by his mother with a 2-day history of a runny nose, cough and increased work of breathing

A 9-month-old boy is brought to the GP by his mother with a 2-day history of a runny nose, cough and increased work of breathing. On examination, the child is wheezing with a respiratory rate of 48 breaths per minute.

Which of the following is the most likely cause of this presentation?