H5N1 Bird Flu Spreads to Native Australian Seabird for First Time

Australia has confirmed its first case of the highly pathogenic H5N1 avian influenza in a native seabird, a development that raises concerns the virus is establishing a foothold in local wildlife populations after its recent arrival on the mainland.

Virus Jumps to Local Species

Laboratory testing confirmed the presence of the H5N1 virus in a greater crested tern found in the coastal town of Robe, South Australia, Agriculture Minister Julie Collins announced Friday. This marks the first confirmed infection in a mainland Australian seabird, as all previous detections were in migratory species.

The finding brings the total number of positive H5N1 detections in the country to 12. Authorities on Friday also confirmed two additional infections in South Australia and one in Western Australia. Minister Collins described the development as "concerning" but not unexpected, noting that scientists are working to determine the infection pathway.

Market and Sector Implications

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While officials stressed there is currently no evidence of mass mortalities or spread to the poultry and agriculture sectors, the jump to a resident bird species increases the risk of transmission. A potential outbreak in commercial poultry or livestock could lead to culling, trade restrictions, and significant economic disruption for Australia's agricultural industry.

Experts are monitoring the situation closely. Hamish McCallum, an infectious diseases ecologist at Griffith University, called the news "very bad news," stating that "it’s likely that this will be the beginning of many more cases." Surveillance efforts are ongoing, though a deceased juvenile fur seal found in New South Wales tested negative for the virus, according to the state's Department of Primary Industries.

Global and National Context

The virulent H5N1 strain has been spreading globally since 2021, devastating wild bird populations and spilling over into mammals and commercial farms. Australia was the last continent to report a mainland case of the virus in June, although it was detected in the sub-Antarctic territory of Heard Island in late 2025.