1-year-old Boy with 3-day History of Fever, Cough, and Hoarseness

1-year-old boy with 3-day history of intermittent fever, cough, and hoarseness

A 1-year-old boy presented with a 3-day history of intermittent fever, barking cough, and hoarseness. The physical examination revealed neck lymphadenopathy and audible stridor, but the patient was not in respiratory distress and was not drooling.

What’s the Diagnosis ?