What does the term "croup" refer to in upper respiratory disorders?

• A. A structural abnormality in the throat
• B. A viral infection in children
• C. A chronic condition affecting adults
• D. An allergy-related rash

Answer: (B)

Croup is a viral infection that causes acute inflammation of the upper airway in children. It’s also known as laryngotracheobronchitis and is most often due to parainfluenza viruses. This infection leads to swelling around the larynx and trachea, producing the classic barking cough and inspiratory stridor, which is typically worse at night. Since croup is a viral illness that commonly affects young kids, the description “a viral infection in children” best fits.

The other descriptions don’t match croup: it isn’t a fixed structural abnormality of the throat, it isn’t a chronic condition in adults, and it isn’t an allergy-related rash.