Flu (Influenza)

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Types
Influenza viruses are designated as type A, B, or C. Influenza A and influenza B viruses are responsible for most outbreaks of the flu. Influenza A viruses usually cause more extensive and severe outbreaks. While type B viruses affect only humans, influenza A viruses affect many different species (e.g., humans, birds, pigs, horses). Influenza C viruses result in mild respiratory illnesses and are not believed to cause flu outbreaks.


Influenza A viruses are further subdivided accordi...Read the full article