Croup is a upper respiratory infection with breathing difficulty and a barking cough. It's usually caused by a virus, such as RSV, adenovirus, or influenza, which infects the upper respiratory tract and causes swollen vocal cords. Croup is common in infants and young children.
- Cold symptoms
- Barking cough that lasts for 3 to 7 days, usually worse at night
- Difficulty breathing
- Stridor (a high-pitched, noisy sound while breathing in)