Which of the following statements are true about croup? 1. Caused by viral organism 2. Most common form of airway obstruction in children aged 6 months to 6 years 3. Causes subglottic swelling and obstruction 4. Most often caused by parainfluenza virus
a. 1 and 3 only
b. 2, 3, and 4 only
c. 3 and 4 only
d. 1, 2, 3, and 4
ANS: D
Croup is a viral disorder of the upper airway that normally results in subglottic swelling and ob-struction. Termed laryngotracheobronchitis, viral croup is usually caused by the parainfluenza vi-rus and is the most common form of airway obstruction in children between 6 months and 6 years of age.
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