Australian authorities are awaiting confirmation of the nation’s first suspected case of the highly pathogenic H5N1 bird flu, detected in a migratory bird in Western Australia. Tests conducted at CSIRO laboratories in Geelong are expected to confirm whether the virus, which has caused significant wildlife mortality globally, including mass deaths of marine mammals on sub-Antarctic islands, is present on the mainland.

The bird, identified as a brown skua seabird—a sub-Antarctic species rarely seen in the region—was found sick on June 14 near Cape Le Grand beach, approximately 56 kilometers east of Esperance. After being taken into care, the bird subsequently died. A second bird, a giant petrel discovered nearby, is also being tested to determine any connection or additional cases.

Federal Agriculture Minister Julie Collins emphasized the seriousness of the situation and assured the public that the government is well-prepared. “We have invested early and are moving as quickly as possible to confirm these results,” she said. While H5N1 primarily affects wild birds and animals, Ms Collins acknowledged the possibility, albeit rare, of the virus spreading to farmed poultry or other livestock, based on experiences overseas. The government has engaged health and environmental agencies alongside state authorities in an integrated response to manage potential risks.

Western Australia’s Agriculture Minister Jackie Jarvis highlighted the role of established early detection systems in identifying the case. She confirmed that the bird died after isolation and treatment efforts and noted that testing continues on the second sick bird.

Environmental groups have expressed concern over the potential ecological impact should H5N1 be confirmed on the continent. The Invasive Species Council warned that the virus could have “catastrophic” effects on native bird populations and mammals, citing the recent deaths of over 13,000 elephant seal pups on Heard Island as an ominous sign. The Council’s policy director, Carol Booth, called the detection “deeply concerning,” noting the virus’s expanding ability to infect mammals poses risks beyond avian species.

Opposition agriculture spokesperson Darren Chester called the development “serious” and stressed the importance of sustained biosecurity surveillance and preparedness. He urged ongoing investment in response capabilities to mitigate potential impacts on both wildlife and agriculture.

While human infections with H5N1 have occurred only rarely overseas, authorities are including public health agencies in their coordinated monitoring and response efforts. The government has stated that, if the presence of H5N1 is confirmed, early detection will assist in managing and potentially containing its spread within Australia.