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"It’s not quite as simple as that, though, since another of the flu genes analyzed by Taubenberger looks very much as if it came from human flu. This wasn’t just bird flu passed on by a pig, in other words. This could well have been bird, pig, and human flu that somehow got mixed up together. The pig must have already been infected with one flu when it picked up the other: what it passed on to the farmer was a hybrid."

https://www.newyorker.com/magazine/1997/09/29/the-dead-zone