Avian flu, or bird flu, affects poultry and wild birds. And now a Human!
As with other viruses, there are lots of different strains, most of which cause few or no symptoms in infected wild birds. But the recent outbreak is of Highly Pathogenic Avian Influenza (HPAI), which can cause severe disease and high mortality. This strain has devastated UK wild bird populations since Summer 2021. It originated in intensive poultry operations in Asia in 1996
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https://www.rspb.org.uk/birds-and-wildlife/avian-influenza-updates