What is Swine Flu?

Swine influenza (also swine flu) refers to influenza caused by any strain of the influenza virus that is endemic in pigs (swine). Strains endemic in swine are called swine influenza virus (SIV). Of the three genera of Orthomyxoviridae that are endemic in humans, two are endemic also in swine: Influenzavirus A (common) or Influenzavirus C [...]