Australia Confirms First H5N1 Bird Flu Cases in Wild Seabirds, Virus Reaches Every Continent

Australia’s agricultural and environment ministries confirmed the first mainland detections of highly pathogenic H5N1 avian influenza in Western Australia. The virus was identified in a brown skua found dead on a beach near Esperance and later in a giant petrel recovered from the same coastal area. These are the first confirmed cases of the H5N1 clade 2.3.4.4b strain on the Australian continent, ending the nation's status as the only continent free of the virus.

Experts say the birds likely introduced the virus while migrating across the Southern Ocean, linking the outbreak to earlier detections on the sub‑Antarctic Heard and McDonald Islands. Authorities have intensified surveillance of wild birds and marine mammals, and the Department of Agriculture has urged the public to avoid handling sick or dead birds and to report sightings. Biosecurity measures are being tightened for poultry producers; Inghams Group placed its Western Australian farms and processing facilities under precautionary lockdown. No infections have been reported in commercial poultry or in humans, and officials say the current human health risk remains low. Ongoing monitoring will determine whether the virus spreads to other wildlife, livestock or domestic flocks.