Bird could cause the next pandemic in humans, the has warned, as the H5N1 strain spreading on farms continued to mutate.In a report quietly published late last week, the agency said viruses 'have pandemic potential' in a section about rolling out vaccines if there is a human spillover.Also last week, a separate study by the US Department of Agriculture released genetic data showing the H5N1 strain tearing through dairy farms had acquired dozens of new mutations.
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