Based on Sean's signs, which viral respiratory illness is most likely?

Based on Sean's signs, which viral respiratory illness is most likely?

• A. Pharyngitis
• B. Croup
• C. Bronchiolitis
• D. Epiglottitis

Answer: (C)

Bronchiolitis is most likely when an infant presents with a viral lower respiratory infection characterized by cough with wheezing and signs of increased work of breathing, such as rapid breathing or chest retractions. This pattern happens as the virus (most often RSV) inflames the small airways, leading to wheezes and crackles on auscultation and variable hypoxia in more severe cases. The history usually follows a brief upper respiratory infection with nasal congestion and then a cough that becomes wheezy. Other conditions have distinct features that don’t fit this pattern. Pharyngitis typically shows a red, sore throat and fever without lower airway wheeze. Croup presents with a barky cough and inspiratory stridor due to upper airway swelling. Epiglottitis involves drooling, severe dysphagia, and a toxic appearance with possible sudden airway obstruction. So, the signs described align with bronchiolitis because they point to a viral infection of the lower airway in an infant, manifesting as cough, wheeze, and increased work of breathing rather than primarily sore throat, upper airway noise, or drooling.

Bronchiolitis is most likely when an infant presents with a viral lower respiratory infection characterized by cough with wheezing and signs of increased work of breathing, such as rapid breathing or chest retractions. This pattern happens as the virus (most often RSV) inflames the small airways, leading to wheezes and crackles on auscultation and variable hypoxia in more severe cases. The history usually follows a brief upper respiratory infection with nasal congestion and then a cough that becomes wheezy.

Other conditions have distinct features that don’t fit this pattern. Pharyngitis typically shows a red, sore throat and fever without lower airway wheeze. Croup presents with a barky cough and inspiratory stridor due to upper airway swelling. Epiglottitis involves drooling, severe dysphagia, and a toxic appearance with possible sudden airway obstruction.

So, the signs described align with bronchiolitis because they point to a viral infection of the lower airway in an infant, manifesting as cough, wheeze, and increased work of breathing rather than primarily sore throat, upper airway noise, or drooling.