H5N1 bird flu confirmed in Australia mainland: What it means
Synopsis
Mainland Australia is now the last continent to confirm an H5N1 bird flu case, after a migratory brown skua died in southern Western Australia. With a second bird under testing and no poultry infections reported yet, the window for containment is open — but Environment Minister Murray Watt's warning about the 'very significant impact on wildlife' signals just how high the stakes are.
Key Takeaways
Australia confirmed its first mainland H5N1 avian influenza case on 21 June 2025 , making it the last continent to do so.
A migratory brown skua found dead in southern Western Australia on 14 June tested positive for the highly pathogenic strain.
A second bird, a giant petrel , found sick in the same area, is awaiting H5N1 test results.
Environment Minister Murray Watt confirmed there is no evidence of a wider outbreak or impact on poultry as of 22 June .
The H5N1 clade 2.3.4.4b variant has caused unprecedented wild bird and poultry deaths across Africa, Asia, Europe, and the Americas since 2020 .
Authorities are urging the public to report dead birds in WA to assist early-detection efforts.
Australia has recorded its first confirmed case of the highly pathogenic H5N1 avian influenza on the mainland, prompting authorities to stress that the country is as prepared as possible for a potential wider outbreak. The federal government confirmed the case on Saturday, 21 June 2025, after a migratory brown skua found dead in southern Western Australia on 14 June tested positive for the deadly strain.
How the Case Was Confirmed
The brown skua was discovered in southern Western Australia (WA) and subsequently tested by authorities, who confirmed the H5N1 diagnosis on Saturday. With this confirmation, mainland Australia became the final continent to record a verified case of the highly pathogenic strain. The development had been anticipated by officials, who have spent the past two years in intensive preparation for precisely this scenario.
What the Government Said
Speaking on Australian Broadcasting Corporation (ABC) radio on Monday, 22 June, Environment Minister Murray Watt described the confirmed case as 'not an unexpected development.' He emphasised that authorities had been actively preparing for a potential local outbreak for two years. 'I can emphasise that we are as well prepared as we possibly could be for this, but it is a risk that we need to take seriously,' Watt said.
Second Bird Under Testing
A second migratory bird — a giant petrel — was found sick in the same area of southern WA on Thursday and has also been tested for H5N1, with results still pending as of Monday. Watt confirmed there is currently no evidence of a more widespread outbreak, and critically, no indication that the strain has affected poultry. Members of the public reported several instances of dead birds found across WA over the weekend, and authorities have urged Australians to continue reporting such sightings.
The Global Context of H5N1
Avian influenza A(H5N1) is a subtype of influenza virus that infects birds and mammals, and humans in rare instances. The goose/Guangdong lineage of H5N1 viruses first emerged in 1996 and has caused outbreaks in birds ever since. Since 2020, a variant belonging to the H5 clade 2.3.4.4b has triggered an unprecedented wave of deaths among wild birds and poultry across Africa, Asia, and Europe. The virus spread to North America in 2021 and reached Central and South America in 2022, making Australia's mainland confirmation the closing of a global geographic sweep.
What Happens Next
Authorities continue to monitor the situation closely, with results from the giant petrel's test expected shortly. Watt warned that a widespread outbreak 'would have a very significant impact on wildlife in Australia.' Vigilance from the public remains a key component of the government's early-detection strategy, as wildlife surveillance is critical to containing any broader spread before it reaches commercial poultry operations.
Point of View
But the real test will come if the giant petrel also tests positive, signalling localised transmission rather than a single migratory incident. The absence of poultry infections so far is the critical buffer; once that line is crossed, the economic and ecological calculus changes sharply. Australia's geographic isolation, once a natural shield, has proven no match for migratory bird routes.
NationPress
22 Jun 2026
Frequently Asked Questions
What is the H5N1 bird flu case confirmed in Australia?
Australian authorities confirmed on 21 June 2025 that a migratory brown skua found dead in southern Western Australia on 14 June had died from the H5N1 strain of avian influenza. This makes mainland Australia the last continent to record a confirmed case of the highly pathogenic strain.
Has H5N1 spread to Australian poultry?
As of 22 June 2025, there is no evidence that the H5N1 strain has affected poultry in Australia, according to Environment Minister Murray Watt. Authorities are monitoring the situation closely and awaiting test results from a second affected bird.
What is the H5N1 clade 2.3.4.4b variant?
It is a variant of the goose/Guangdong-lineage H5N1 avian influenza virus that has caused an unprecedented number of deaths in wild birds and poultry since 2020, spreading across Africa, Asia, Europe, North America, and Central and South America. It is the strain confirmed in the Australian brown skua.
What should Australians do if they find a dead bird?
Authorities are urging members of the public to report any dead or sick birds found in Western Australia to the relevant authorities. Public reporting is a key part of the government's early-detection and containment strategy.
How long has Australia been preparing for an H5N1 outbreak?
According to Environment Minister Murray Watt, Australian authorities have spent two years intensively preparing for a potential local outbreak of the H5N1 strain. He described the confirmed case as 'not an unexpected development' given the global spread of the virus.
