Australia has reported its first mainland case of H5 high pathogenicity avian influenza , marking the spread of the deadly virus to every continent on the planet. The strain was confirmed in a brown skua and a giant petrel, both migratory seabirds found in an isolated area near Esperance, Western Australia.
Authorities say there is currently no evidence of infection among poultry. However, the detection has triggered a shift in national biosecurity strategy, with a focus now on wild shorebird surveillance and on-farm protections to prevent the virus from crossing into the domestic food supply. Housing orders now require poultry keepers in affected regions to confine birds indoors.
The concern is well-founded: an earlier H5 outbreak on Australia's remote Heard and McDonald Islands killed more than 13,000 southern elephant seal pups — over 75% of the breeding cohort — along with several hundred adult king penguins, offering a stark preview of the virus's potential impact on dense wildlife populations.