What is the etiology of influenza?

Updated: Apr 23, 2019
  • Author: Hien H Nguyen, MD, MS; Chief Editor: Michael Stuart Bronze, MD  more...
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Influenza results from infection with 1 of 3 basic types of influenza virus: A, B, or C. Influenza A is generally more pathogenic than influenza B. Epidemics of influenza C have been reported, especially in young children. [19] In the United States, during the 2011-2012 influenza season, H3N2 viruses predominated overall, but H1N1 and influenza B viruses also circulated widely. [20] Influenza viruses are classified within the family Orthomyxoviridae.

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