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Classification of Influenza Viruses

In virus classification influenza viruses are RNA viruses that make up three of the five genera of the family Orthomyxoviridae:

  Influenzavirus A
  Influenzavirus B
  Influenzavirus C
  Influenzavirus D


These viruses are only distantly related to the human parainfluenza viruses, which are RNA viruses belonging to the paramyxovirus family that are a common cause of respiratory infections in children such as croup, but can also cause a disease similar to influenza in adults.

Figure 1. Noimanclature of influenza viruses