Keith Poulsen’s jaw dropped when farmers showed him images on their cellphones at the World Dairy Expo in Wisconsin in October. A livestock veterinarian at the University of Wisconsin, Poulsen had ...
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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