Australia has confirmed its first case of the deadly H5N1 bird flu in a native seabird, marking a significant development in the country’s outbreak.

The virus was detected in a greater crested tern found dead at Robe Marina on South Australia’s Limestone Coast.

Until now, all H5N1 cases in Australia had been linked to migratory seabirds infected overseas.

Authorities have stepped up surveillance, but say there is currently no evidence of widespread bird deaths or infection in poultry.

Wildlife experts warn the discovery could signal local transmission, increasing the risk to Australia’s native bird and marine animal populations.

The public has been urged not to handle sick or dead birds and to report any suspected cases to biosecurity authorities immediately.