H5N1 bird flu genes show nature can pick worrisome traits

[unable to retrieve full-text content](University of Wisconsin-Madison) In the beginning, all flu viruses came from birds. Over time, the virus evolved to adapt to other animals, including humans, as natural selection favored viruses with mutations that allowed them to more readily infect the cells of new host species.Source: http://www.eurekalert.org/pub_releases/2013-10/uow-hbf102113.php
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