Australia confirms first H5N1 bird flu case in local mammal

Australia has officially confirmed its first case of H5N1 bird flu in a mammal, with the deadly virus detected in a long-nosed fur seal located in South Australia. The highly pathogenic avian influenza, which entered the country in June, has been causing rising concerns across the nation. The seal, found at Beachport, approximately 310 kilometers south of Adelaide, was observed dead with no apparent injuries.

South Australian authorities stated that the seal's death does not seem to be linked to other sick or deceased marine mammals. Federal Agriculture Minister Julie Collins made this announcement during televised remarks. She also noted that once the H5 bird flu spreads in the environment, it is impossible to prevent significant losses.

This development comes after Australia reported its first mass seabird deaths from the virus this month, indicating the escalation of the outbreak. The virus, initially identified in migratory seabirds, has now spread to native species. Thus far, the virus has not been found in Australia's poultry or agriculture, as confirmed by the federal government.

The government reported 297 cases nationwide. Notably, Australia was the last continent to report bird flu, with the virus detected on the sub-Antarctic Heard Island in late 2025. Over 13,000 baby seals were reportedly killed by the virus on the island, according to local media.