. Since bird flu was first discovered in U.S. cattle last year, the virus has spread to more than 1,000 herds across the country. A new vaccine for cattle has …
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. Bird flu vaccines for cattle could reduce the risk of animal-to-human transmission of the H5N1 virus.Credit: Dmitriy Shironosov/Alamy As bird flu sweeps across US poultry and cattle farms, researchers …