Swine influenza (also swine flu) refers to influenza caused by any virus of the family Orthomyxoviridae, that is endemic to pig (swine) populations. Strains endemic in swine are called swine influenza virus (SIV), and all known strains of SIV are classified as Influenzavirus A (common) or Influenzavirus C (rare). Influenzavirus B has not been reported in swine. All three clades, Influenzavirus A, B, and C, are endemic in humans. (more…)
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