What is the primary feature of croup in infants and children?

The primary feature of croup in infants and children is the obstruction of the larynx. Croup, often associated with viral infections, leads to swelling in the laryngeal area, which can cause a narrowing of the airway. This swelling is typically a response to inflammation, and it results in characteristic symptoms such as a "barking" cough, stridor (a high-pitched wheezing sound during inhalation), and hoarseness.

Understanding this pathophysiology is crucial, as laryngeal obstruction can significantly impact breathing and necessitate prompt assessment and intervention. The focus on this feature emphasizes the importance of recognizing the signs of respiratory distress in pediatric patients, which is essential for effective management and treatment.