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Conditions and Diseases
Cold and Flu
Viruses (biological)

What is the causative organism of seasonal influenza?


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October 27, 2014 6:25PM

The human seasonal flu, as well as other types of human influenza, are caused by three types of viruses: influenza Types A, B, and C. Swine flu is caused by an influenza type A influenzavirus, for example. Type A flu viruses have been the causes of all influenza pandemics to date.

Within each type there are mutations and countless numbers of strains and subtypes. The influenza viruses are RNA viruses that come from the family Orthomyxoviridae.

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October 27, 2014 6:23PM

Human influenza causing viruses can belong to any of three major influenza-causing Orthomyxoviruses: Influenza A virus, Influenza B virus and Influenza C virus. Keep in mind that the "flu" is a severe upper respiratory infection and doesn't affect the intestinal tract.