Australia has entered a new phase in dealing with the deadly H5N1 bird flu strain, with authorities confirming local transmission for the first time. The announcement came after 11 new suspected detections were reported in South Australian birds, including four cases on Kangaroo Island, home to the country's third-largest Australian sea lion colony.
Local Transmission Confirmed
Federal Agriculture Minister Julie Collins said Wednesday that the Consultative Committee on Emergency Animal Diseases agreed that local transmission had occurred among greater crested terns in South Australia. Genetic sequencing shows all confirmed cases are related to sub-Antarctic strains, according to Chief Veterinary Officer Dr. Beth Cookson.
SA Primary Industries Minister Clare Scriven noted the development was concerning but not unexpected, as the virus has spread on every other continent.
Risk to Wildlife, Especially Sea Lions
One detection at Seal Bay on Kangaroo Island has raised alarms for the endangered Australian sea lion population. Alexia Wellbelove, campaigns director at the Australian Marine Conservation Society, warned that the species is now on the frontline of a potential wildlife crisis. About 80% of Australian sea lions live in South Australia, with numbers declining 60% over four decades to around 12,000.
Wellbelove highlighted that in South America, the virus killed 30,000 sea lion pups in six months after transmission from birds. On Heard Island, more than 13,000 elephant seal pups died in a single season. On-beach tours at Seal Bay have been temporarily paused to protect the vulnerable animals.
Limited Options to Stop Spread
Cookson acknowledged that once the virus becomes widespread in wild birds, it will not be possible to avoid losses in susceptible wildlife. Authorities are focusing on surveillance and reducing impacts where possible. The federal government has invested over $113 million preparing for the virus, with an additional $24 million recently released.
Groups including the AMCS and the Invasive Species Council have called for a $200 million national wildlife resilience fund for emergency protection of at-risk species.
Potential Broader Impacts
Worldwide, H5N1 has killed millions of wild birds and tens of thousands of mammals. In Australia, more than 150 native bird species and over 10 mammal species are assessed at very high risk of extinction or major decline if infected. The poultry industry also faces threats; globally, 140 million farmed birds have died or been culled since January 2024. In the US, the virus was linked to a 220% spike in egg prices in early 2025. Human-to-human transmission remains rare, but since 2003 there have been 1,000 cases globally with a 48% fatality rate.
