ROME (AP) — The United Nations has warned of a possible resurgence of the deadly bird flu virus and has urged greater surveillance.
The U.N. Food and Agriculture Agency says a mutant strain of H5N1 avian influenza, which can apparently sidestep defenses of existing vaccines, is spreading in China and Vietnam.
Last week, the U.N. reported that a 6-year-old Cambodian girl had …
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