H5N1 bird flu reaches Australia, completing its spread to every continent
Australia confirmed its first mainland case of highly pathogenic H5N1 avian influenza on Saturday, in a migratory brown skua found in Cape Le Grand National Park in Western Australia; a giant petrel in the same area is also suspected to be infected. With that detection, the virus has now been recorded on every continent — Australia had been the last holdout, after H5N1 was found in late 2025 on the remote sub-Antarctic Heard Island, some 4,100km offshore.
Agriculture Minister Julie Collins said the virus has not reached the country’s poultry or agricultural sector, and Prime Minister Anthony Albanese said the government would do “whatever we can” to limit further spread. Human infections remain rare, though the strain has driven the culling of hundreds of millions of birds worldwide and pushed up egg and poultry prices.
The arrival is most consequential for wildlife and biosecurity rather than for immediate human risk. Australia’s island geography and strict controls had kept the mainland clear longer than anywhere else; a foothold in migratory seabirds is hard to contain and raises the odds of spillover into native species and, eventually, domestic flocks. The practical test now is whether surveillance and culling can keep the virus out of commercial poultry, where outbreaks elsewhere have caused the steepest economic damage.