The H5N1 strain of highly pathogenic avian influenza has been confirmed on the Australian mainland following the death of a brown skua in Western Australia. Federal Agriculture Minister Julie Collins confirmed the detection, marking the end of Australia’s status as the only continent free of the virus. Authorities are currently monitoring a second bird, a giant petrel, as part of a nationally coordinated response to determine if the disease has spread to local wildlife or poultry populations.
How did H5 bird flu reach Australia?
The virus likely arrived via migratory seabirds traveling from the subantarctic, according to BirdLife Australia. Researchers believe the H5N1 clade 2.3.4.4b strain reached Australian territory in August 2025, specifically hitting Heard Island, located 4,000km south-west of Perth. There, the virus caused significant mortality among king penguins and southern elephant seal pups, with losses exceeding 13,000 seal pups. The recent identification of the infected brown skua at Cape Le Grand national park confirms the virus has now breached the mainland.
More than 560 wild bird species and over 100 types of mammals have been affected by H5N1 globally since the current panzootic began in 2021, according to Wildlife Health Australia.
What are the risks to Australian native wildlife?
Threatened Species Commissioner Dr. Fiona Fraser warns that if the virus becomes established in local wildlife, options for containment are limited. Experts have identified high-risk species, including the critically endangered orange-bellied parrot, the Tasmanian devil, and the Australian fur seal. Jack Gough of the Invasive Species Council notes that the risk is no longer theoretical and could push already vulnerable species toward extinction. The Australian Marine Conservation Society has specifically highlighted the Australian sea lion, which numbers only 12,000, as being at acute risk of extinction should the virus circulate within its colonies.
How does H5 differ from previous poultry outbreaks?
The H5N1 strain is distinct from the H7 bird flu outbreaks that impacted Australian poultry farms throughout 2024 and 2025. While the H7 outbreaks resulted in the culling of hundreds of thousands of chickens, Dr. Michelle Wille of the University of Melbourne points out that H5 has historically caused much larger-scale disruptions internationally. In the United States, for instance, the arrival of H5 led to the culling of more than 200 million chickens. To date, Minister Collins reports there is no evidence of H5 infection within Australia’s commercial poultry industry.
Comparison: H5 vs H7 Outbreaks
| Feature | H7 Bird Flu | H5N1 Bird Flu |
|---|---|---|
| Recent Impact | Significant culling of Australian poultry (2024-25) | First mainland detection (2025) |
| Global Context | Regional outbreaks | Global panzootic; millions of birds dead |
What is the risk to human health?
The risk of H5N1 infection for the general public remains low, according to Dr. Matt Mason from the University of the Sunshine Coast. While the virus can cause severe disease or death, human-to-human transmission is limited. Most global cases have been linked to direct contact with infected poultry or, in the United States, dairy cattle. Between 2003 and early 2026, the World Health Organization recorded 997 human cases globally, with 478 fatalities. Health authorities advise the public to avoid touching or handling any sick or dead wild animals.
If you encounter a sick or dead bird or marine mammal, do not touch it. Report the sighting immediately to the emergency animal disease hotline at 1800 675 888 or visit birdflu.gov.au.
Frequently Asked Questions
Can I catch bird flu from my pet bird?
The risk is very low, but you should always monitor your pets for illness and keep them away from wild birds. Consult a veterinarian if you notice unusual symptoms.
Is it safe to eat poultry and eggs?
Yes. According to current health guidelines, there is no evidence that the virus is transmitted through properly cooked poultry or eggs.
What is being done to protect wildlife?
The federal government has developed over 100 response plans for at-risk species and critical habitats, such as Ramsar wetlands, to monitor and mitigate the spread of the virus.
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