In a pediatric patient with fever, cough, and respiratory distress with diffuse wheezes and crackles, which diagnosis is most likely?

• A. Bronchiolitis
• B. Croup
• C. Epiglottis
• D. Asthma

Answer: (A)

Bronchiolitis is a viral infection of the small airways that most often affects infants and young children. It presents with fever, cough, and noticeable respiratory distress, and on exam you typically hear diffuse wheezes and crackles as the inflammation and mucus narrow and fill the small airways. This pattern fits well with a lower-airway illness in a young child.

Croup tends to show a barky, seal-like cough with inspiratory stridor and more upper-airway involvement, while epiglottitis presents with sudden high fever, drooling, and a toxic appearance with possible severe airway obstruction—none of these typically produce diffuse crackles and wheezes throughout the lungs. Asthma can cause wheeze, but fever is not usually a prominent feature, and the overall presentation in a very young child with crackles points more toward bronchiolitis.