Wild birds found to be key drivers of H5N1 outbreak in North America
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University of Pennsylvania Nov 14 2025 Since late 2021, a panzootic, or "a pandemic in animals," of highly pathogenic bird flu variant H5N1 has devastated wild birds, agriculture, and mammals. Unlike previous outbreaks, aggressive culling of domestic birds has not contained it, and the viruses continue to infect a broad range of species, including wild birds and mammals rarely affected before, suggesting that transmission patterns have shifted since 2022. Now, in a new study looking at how
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