What is the etiology of croup?

Updated: Oct 09, 2019
  • Author: Germaine L Defendi, MD, MS, FAAP; Chief Editor: Russell W Steele, MD  more...
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Viruses causing acute infectious croup are spread through either direct inhalation from a cough and/or sneeze, or by contamination of hands from contact with fomites with subsequent touching the mucosa of the eyes, nose, and/or mouth. The most common viral etiologies are parainfluenza viruses. The type of parainfluenza (1, 2, and 3) virus causing croup outbreaks varies each year.

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