A 6-month-old infant presents during winter with rhinorrhea, low-grade fever, tachypnea, expiratory wheezing, and bilateral subcostal retractions. What is the most common viral etiology of acute bronchiolitis?
Answer and explanation
Correct answer: B. Respiratory syncytial virus (RSV)
- Step 1: Acute viral bronchiolitis is the leading cause of infant lower respiratory tract infection.
- Step 2: Respiratory syncytial virus (RSV) accounts for 50-80% of all bronchiolitis admissions during seasonal winter epidemics.
- Step 3: Parainfluenza is the primary cause of croup, while RSV causes bronchiolitis.
Answer
Respiratory syncytial virus (RSV).
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