" Swine influenza or swine flu (commonly misspelled swine flue) refers to a range of influenza cases that are caused by viruses endemic to pigs. Swine flu infects some people every year, typically those in close contact with pigs. " To learn more about it please see the Flu Wiki article on Swine flu. For a longer term view, see Wikipedia, which tells us: Swine influenza virus (referred to as SIV) refers to influenza cases that are caused by Orthomyxoviruses endemic to pig populations. Get more info on the Flu Wiki at flu.wikia.com.