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Croup is also known as laryngotracheitis, a medical term that describes the inflammation of the trachea (windpipe) and larynx. Parainfluenza viruses are the typical root cause of the infection, but influenza (flu) and cold viruses may sometimes be responsible.
Croup (or laryngotracheobronchitis) is a respiratory condition that is usually triggered by an acute viral infection of the upper airway.The infection leads to swelling inside the throat, which interferes with normal breathing and produces the classical symptoms of a barking cough, stridor, and hoarseness.iral croup or acute laryngotracheitis is caused by parainfluenza virus, primarily types 1 and 2, in 75% of cases. Other viral causes include influenza A and B, measles, adenovirus and respiratory syncytial virus (RSV).