Australian authorities have confirmed the first documented case of H5 bird flu in a little penguin on Phillip Island in Victoria, with the infected bird having died. The discovery came only days after the state government announced plans to launch a vaccination program targeting the species.
Phillip Island hosts approximately 40,000 little penguins, constituting the world’s largest colony and a significant tourist destination. The government indicated that the deceased bird was located outside the island’s well-known penguin parade area. In response to the detection, officials announced they would commence vaccinating up to 5,000 little penguins across populations at Phillip Island and Melbourne’s St Kilda beach beginning on Monday, establishing what is intended to be the world’s largest H5 vaccination effort for wild birds.
Vaccination of wild bird populations presents logistical challenges, though officials determined the approach feasible for little penguins due to their tendency to return to the same burrows nightly. However, the vaccination regimen requires two doses administered several weeks apart, raising concerns about whether some birds will develop sufficient immunity before potential exposure to the virus.
The detection has heightened concerns among environmental advocates and government officials about potential mass mortality in the iconic penguin population. State leadership emphasized their commitment to protecting the colonies, with the chief biodiversity officer describing vaccination as “a meaningful way in which it can help mitigate the impact of H5 on those populations.”
The confirmed case in a little penguin adds to a broader detection pattern across the region. Victoria reported two additional H5 cases in greater crested terns at Lakes Entrance and Dromana, while New South Wales confirmed its fifth detection in a tern at Eden on the far south coast. Officials indicated they would intensify surveillance efforts in affected areas as the virus continues circulating through wild bird populations.
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