Warm weather, vaccines may be best bet against bird flu

April 23, 2015 12:31 AM

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WASHINGTON – Federal officials are banking on higher temperatures to help knock down avian influenza spreading through U.S. poultry operations, including two in Iowa — even as they work to develop vaccines to counter the deadly virus.

The spread of the H5N2 virus has raised the expected death toll to almost 7 million birds since March — half of them at Sunrise Farms in Harris — and officials are concerned that even if the virus wanes this summer it could flare up again when the weather cools.

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