Croup in kids occurs due to a viral infection in the vocal cords and the trachea (windpipe). The infection causes swelling and narrowing of the upper airway, making it difficult for air to pass ...
It can be caused by many different viruses, including influenza, COVID-19 and RSV. However, the most common virus to cause croup is parainfluenza. Because it is caused by viruses, croup is usually ...