H5N1 Has Evolved Into Two Different Forms
Tue, 21 Mar 2006 12:00 PM EST
... Researchers from the US Centers for Disease Control and Prevention (CDC) have discovered that there are now two different forms of the virulent H5N1 bird flu virus strain. It appears that the new variant evolved last year and has infected humans in Indonesia. This will make it more difficult to develop an effective vaccine... click link for more info. ...

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