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" ... What do chickens have to do with human flu pandemics? If you are wondering where the virus came from that caused the 1918 influenza pandemic, scientists would give you the bird. The influenza A virus strain that killed more humans in 1918-1919 than all of World War I wasn't always a human flu virus. It started off as an avian flu virus, just circulating among birds. Avian is another more sciency word for bird. But over time through either mutations or possibly exchanging genetic material with human flu viruses, this bird flu strain acquired the ability to infect and spread among humans. This left humans in deep doo-doo. Their bodies were not ready for this new strain and thus left relatively defenseless. ... "