Bruce Janke Iowa State University

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Swine Influenza

Publish Date: 06/03/2006

The first descriptions of influenza in swine appeared in reports of a new disease affecting pigs on farms in western Illinois in 1918. The outbreaks occurred during the time of the great human influenza pandemic (“Spanish flu”) that was responsible for the death of over 20 million people worldwide. Because of the similarity in clinical signs to the disease in humans, the disease in swine was called “hog flu.” But another 12 years passed before researchers proved that the disease is caused by a virus in both swine and humans. The viruses responsible for illness in pigs and people were virtually indistinguishable, and these isolates served as the prototype classical Type A H1N1 influenza viruses. Most researchers believe that the virus, which originally existed in ducks, likely passed from the human to swine populations during the pandemic.


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