Does the etiologic agent for croup vary among age groups?

Updated: Oct 09, 2019
  • Author: Germaine L Defendi, MD, MS, FAAP; Chief Editor: Russell W Steele, MD  more...
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The different parainfluenza types have a more prominent role in the infectious process, as related to the patient’s age. Infection with type 3 occurs most often in infants and is the etiology of lower respiratory tract illness; by age 1 year, 50% of infants have acquired this infection. Respiratory infections in children aged 1-5 years are most often due to type 1, less so with type 2. [2]

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