Over the past few years, significant media attention has been paid to detecting avian influenza (bird flu). While the overall human health risk is being evaluated, the World Health Organization (WHO) recently shared clarifying data points.
During 2020, highly pathogenic avian influenza (HPAI) A(H5N1) clade 2.3.4.4b viruses arose from previously circulating influenza A(H5Nx) viruses. They spread predominantly via migratory birds to many parts of Africa, Asia, and Europe.
In late 2021, these bird flu viruses crossed to North America and, in late 2022, to South America.
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