Global spread of H5N1 | Wikipedia

The global spread of H5N1 influenza in birds is considered a significant pandemic threat. While other H5N1 influenza strains are known, they are significantly different on a genetic level from a highly pathogenic, emergent strain of H5N1, which was able to achieve hitherto unprecedented global spread in 2008.
en.wikipedia.org/wiki/Global_spread_of_H5N1

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