Antarctica Journal flags bird flu in Arctic
- Nature Communications reported April 7 that H5N1 reached Antarctica through multiple introductions from South America, infecting eight species across the South Shetland Islands. - The paper identified H5N1 in skuas, petrels, gulls, terns, shags, Antarctic fur seals and southern elephant seals during 2023-25 field seasons. - New vaccine and organoid studies widen the threat beyond farms to wildlife and mammals. (news.unl.edu)
Bird flu is no longer only a poultry outbreak. A Nature Communications paper published April 7 traced H5N1 infections in Antarctic wildlife to multiple introductions from South America. (nature.com) The researchers found the virus in carcasses from eight species during the 2023-2024 and 2024-2025 austral summers in the South Shetland Islands. The list included skuas, Antarctic terns, Antarctic shags, petrels, kelp gulls, Antarctic fur seals and southern elephant seals. (nature.com) Genetic sequencing showed the Antarctic viruses did not come from one single incursion. The paper said some strains clustered with South American marine-mammal outbreaks, while another group linked to viruses from South Georgia and the Antarctic Peninsula. (nature.com) That matters because influenza moves with hosts. The Pan American Health Organization said migratory wild birds have driven recent spread, while mammal infections have expanded and 68 mammalian species had been reported affected by December 2025. (paho.org) For people, bird flu is still mainly an exposure risk tied to infected animals, not sustained human spread. The Centers for Disease Control and Prevention said on March 6 that the current public-health risk is low and that the U.S. had recorded 71 human cases since 2024, with no known person-to-person spread. (cdc.gov) Scientists are also trying to map which animals the virus can infect before field outbreaks reveal it the hard way. Forbes reported April 28 that researchers are using lab-grown miniature airways from wildlife species to test host range and adaptation. (forbes.com) A separate Nebraska team is working on the farm side of the problem. The University of Nebraska-Lincoln said April 27 that virologist Eric Weaver and colleagues developed a vaccine approach that produced strong immune responses in mice and dairy calves and fully protected mice against lethal infection in preclinical tests. (news.unl.edu) Nebraska said the calves were vaccinated at one week old with intramuscular and intranasal doses, then boosted four weeks later. The researchers said there are currently no licensed H5N1 vaccines for cattle. (news.unl.edu) Texas Biomedical Research Institute is pursuing a human vaccine and using organoids, or miniature 3D tissue models, to study damage after infection. Texas Biomed said a single dose of its live attenuated vaccine protected mice in early studies, and separate organoid work found the current H5N1 strain can remodel airway cells and produce scar tissue. (txbiomed.org) The picture now is a virus moving across continents, seabird colonies, marine mammals, cattle and a limited number of exposed workers. The next phase is not one headline but surveillance: genomes in the field, airway models in the lab and vaccines that can keep up. (nature.com) (cdc.gov) (news.unl.edu)
