Scientists reveal evidence of the 's origin - a fish that lived 600 million years ago.
A team from the University of scoured a genetic database of fish for an influenza-related virus, uncovering one in the intestine of a Siberian sturgeon.
In comparing the genetic sequence of the virus in the sturgeon with those of all known influenza viruses, the team found that it closely matches the predicted sequence of the ancestor of these viruses.
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