H5N1 Bird Flu Kills Thousands of Sub‑Antarctic Seal Pups, Traced to Crozet Islands
TL;DR Summary
A deadly H5N1 bird flu outbreak has killed an estimated 13,000 southern elephant seal pups on Heard Island and McDonald Island, with a 76% mortality rate across about 17,000 births; several hundred adult king penguins have also died. Genetic data suggest the virus arrived from the French Crozet Islands around August 2025 and has been spreading eastward through sub‑Antarctic wildlife, a finding reported in BioRxiv (not yet peer‑reviewed).
Topics:health#crozet-islands#h5n1-bird-flu#heard-island-and-mcdonald-islands#seal-pup-mortality#southern-elephant-seals#world
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