Skip to content

First Australian mass bird mortality linked to H5 bird flu

scienceAug 1, 202615263

Helicopter surveillance off South Australia found 49 dead and 35 sick greater crested terns on Baudin Rocks near Robe, more than 80 birds that authorities say are suspected to be Australia’s first mass mortality event from H5N1 bird flu, six weeks after the virus arrived in the country. South Australia reported three other suspected positive crested terns, including one at Monarto inland near poultry farms, and three suspected positive silver gulls, adding to an earlier silver gull confirmed positive by CSIRO. Victoria confirmed its first H5 detection in a greater crested tern in Portland and sent samples from five crested terns to the CSIRO lab in Geelong; five confirmed cases at Seal Bay on Kangaroo Island raised concerns for endangered Australian sea lions. South Australia’s chief veterinary officer Skye Freuan said testing is underway and called it likely the first mass mortality event, but said there is nothing authorities can do to stop spread and that surveillance is operating. Conservation figures warned of rapid escalation: BirdLife Australia chief executive Kate Millar called it a very significant escalation, and Invasive Species Council chief executive Jack Gough said the pattern mirrors South America’s early rapid spread and mass deaths. Officials said reported detections rose by 20 in a few days earlier this week to a total of 53, and authorities will continue aerial surveillance and monitoring while testing continues.

Professor Euan Ritchie FAMS
@euanritchie.bsky.social

So, is _now_ a good time for us to see all the wildlife risk assessments and response plans? Asking for lots of ecologists and other experts. First Australian mass mortality event suspected as deadly bird flu virus rapidly escalates among native birds www.theguardian.com/world/2026/a...

18145d ago
1 source