As birds fly south for the winter, they're carrying with them some unwelcome cargo: the H5N1 virus, or bird flu. In the past 30 days, the virus has struck 66 poultry flocks, leading to the deaths of ...
Avian H5N1 took a big leap about four years ago. Previously the virus, first detected in the mid-1990s, would tear through domesticated poultry, killing off flocks in days. It occasionally jumped to ...
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