Abstract
Our study has for the first time identified H5N1 strains (clade 2.3.4.4b, genotype B3.2) in brown skuas from the Fildes Peninsula, South Shetland Islands, Antarctica. These findings indicate that highly pathogenic avian influenza H5N1 viruses is now actively circulating in Antarctic ecosystems, representing a significant expansion of its geographic range.
Competing Interest Statement
The authors have declared no competing interest.
Funder Information Declared
National Key Research and Development Program of China, 2024YFC2813605, 2023YFC2605504
Source: BioRxIV, https://www.biorxiv.org/content/10.1101/2025.09.06.674605v1
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