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Suspected H5 Bird Flu Outbreak Kills Hundreds of Seal Pups on Sub-Antarctic Island

Scientists observed unusual elephant seal deaths with neurological and respiratory symptoms possibly linked to H5N1 bird flu, pending lab confirmation after samples return to Australia.

  • On Friday, Australian Antarctic Program scientists observed signs consistent with H5 avian influenza on Heard Island and reported unusual elephant seal deaths pending lab confirmation.
  • After outbreaks on Kerguelen and Crozet islands, authorities mounted a mission aboard RSV Nuyina, following H5 avian influenza detection less than 450km from Heard Island.
  • Scientists observed neurological and respiratory symptoms in elephant seals, including torticollis and animals collapsing, while Heard Island’s remoteness about 4,000km south-west of Perth complicated testing.
  • Samples have been collected and will travel with the RSV Nuyina for testing in Australia; the Australian federal government has invested more than $100 million in preparedness while urging vigilance.
  • Dr Michelle Wille warned the disease had been `catastrophic everywhere` and South America lost more than 30,000 sea lions, 17,000 seal pups and at least 650,000 native birds.
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SBS News broke the news in Sydney, Australia on Thursday, October 23, 2025.
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