SWINE FLU

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SWINE FLU

Swine influenza (also swine flu) refers to influenza caused by any strain of the influenza virus endemic in pigs (swine). Strains endemic in swine are called swine influenza virus (SIV).Of the three genera of human flu, two are endemic also in swine: Influenzavirus A is common and Influenzavirus C is rare. Influenzavirus B has not been reported in swine. Within Influenzavirus A and Influenzavirus C, the strains endemic to swine and humans are largely distinct.
 
http://bioisolutions.blogspot.com/2009/04/swine-flu-animation.html