ROME (Reuters) - The United Nations warned of a possible major resurgence of bird flu and said a mutant strain of the H5N1 virus was spreading in Asia and elsewhere. The UN's Food and Agriculture Organization (FAO) on Monday urged increased surveillance and preparation for a potential outbreak of the virus, which it says has infected 565 people since it first appeared in 2003, killing 331 of them. The virus was eliminated from most of the 63 countries infected at its peak in 2006 after mass...
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