Croup is the most common cause of stridor in a febrile child. Parainfluenza type 1 virus is the most common cause of croup in pediatric patients, which can be recovered in up to 60% of cases. Children between the ages of 6 months and
3 years are most commonly affected by croup, which occurs more commonly in the winter months. Croup begins with a prodrome of a few days of mild upper respiratory infection. Inspiratory stridor is a prominent symptom in severe cases of croup.