On 20 June 2026, WOAH was notified of the first detection of high pathogenicity avian influenza (HPAI) H5N1 in Australia in a marine wild bird, a migratory brown skua (Stercorarius antarcticus).
The virus is related to H5N1 HPAI clade 2.3.4.4b viruses, which is the same subtype that is predominantly circulating in poultry, wild birds, and mammals globally.
Enhanced general and targeted surveillance is underway by the animal health authorities to determine the extent of infection.
An epidemiological investigation has commenced.
HPAI H5N1 has caused a global panzootic since 2021, affecting wild birds, poultry, and multiple mammalian species.
Until recently, Australia remained free of this particular subtype despite widespread international incursions.
Since its emergence, this H5N1 subtype has crossed continents, reaching North and South America in 2022 and extending to the Antarctic islands in 2023.
It has since been detected in new host species such as cattle, and marine mammals, caused sporadic human infections, driven exceptionally high activity in wild birds in 2025, and is now being reported in Australia for the first time.
The World Organisation for Animal Health (WOAH) acknowledges Australia’s immediate notification of Influenza A virus of high pathogenicity in non-poultry birds through the World Animal Health Information System (WAHIS) and commends Australia for its longstanding commitment to transparency and to the protection of global animal health.
This notification represents a significant epidemiological event, documenting the first detection of HPAI H5N1 in a wild bird in Australia.
The finding confirms the incursion of this globally circulating virus lineage into wildlife in a subregion that had remained free from this subtype despite its extensive international spread in other regions and sub-regions.
The risk for Australian avifauna, especially endemic bird species is significant.
This detection underscores critical considerations:
° Early detection remains our strongest line of prevention
° Early detection and timely reporting linked to early response measures, are essential in limiting the spread of HPAI and reducing its impact on poultry, livestock, wildlife, livelihoods and human health. This event demonstrates the value of sustained surveillance systems, laboratory capacity and field awareness in identifying emerging threats.
° Transparency and solidarity strengthen global preparedness
° Timely reporting through WAHIS allows countries to access official information, assess risks and coordinate responses based on reliable scientific evidence.
° Preparedness requires sustained investment
Preparedness is best built before an emergency. Recent events demonstrate the cost of waiting. According to WOAH’s State of the World’s Animal Health 2026 report, more than 2,000 outbreaks of HPAI were reported by 64 countries and territories between 2025 and 2026, resulting in the loss or culling of more than 140 million poultry. At the same time, animal health continues to receive only a small fraction – 0.6% – of global health investment. Strong Veterinary Services, well-equipped laboratories, collaboration with WOAH Reference Laboratories, effective surveillance systems, trained personnel, One Health collaboration, international networks of expertise such as OFFLU and emergency preparedness plans do not emerge during a crisis – they are built through sustained investment over time.
° Continued national and international investment remains essential to reduce the impact of HPAI and other emerging animal health threats.
° Multisectoral collaboration
This event also highlights the importance of maintaining strong scientific collaboration networks and engaging stakeholders before emergencies arise. Governments, Veterinary Services, laboratories, researchers, wildlife authorities, public health authorities, industry and international organisations play complementary roles in strengthening preparedness and response.
WOAH remains committed to supporting its Members through international standards, scientific expertise, capacity building and transparent information sharing. As HPAI continues to evolve globally, continued collaboration, preparedness and collective action remain essential to protect animal health, safeguard livelihoods and strengthen global health security.
° WOAH calls on its Members to:
- Maintain enhanced avian influenza SURVEILLANCE in domestic and wild birds and consider HPAI in differential diagnosis for other susceptible wild or domestic animal species.
- REPORT cases of HPAI in all animal species, including in domestic and wild mammals, to WOAH through its World Animal Health Information System (WAHIS) . Genetic sequences of avian influenza viruses should be shared in publicly available databases.
- COLLABORATE with public health authorities, wildlife authorities and other relevant partners through a One Health approach to strengthen surveillance, risk assessment, preparedness and response.
- CONSIDER poultry vaccination as a possible complementary avian influenza control measure;
- PREVENT the introduction and spread of the disease by implementing strict biosecurity measures in poultry holdings and
- EMPLOY good production and hygiene practices when handling animal products. Relevant measures notably include keeping poultry away from contact with wild birds, ensuring good hygiene in poultry housing and equipment and reporting bird illnesses and deaths to the Veterinary Services.
- PROTECT humans and other potentially susceptible mammals (both wild and domestic). People in close contact or exposed to wildlife should always take precautionary measures to avoid getting infected and minimise the risk of mechanically carrying the virus.
- AVOID IMPLEMENTING unjustified trade restrictions. Import risk management measures should be scientifically justified and in line with the WOAH International Standards.
° WOAH is fully committed to supporting its Members to mitigate the risks associated with avian influenza. We will continue to engage with our networks of experts, OFFLU, as well as public and private partners, notably through the One Health Quadripartite and the Global Framework for Transboundary Animal Diseases (GF-TADs) to provide technical updates as more information becomes available.
° In collaboration with its Reference Centres , networks of experts and Members including the WOAH WildNet network of collaborating centres on wildlife health, the WOAH remains in close contact with Australian Veterinary Authorities to monitor the situation to assess the risks to poultry, wildlife, other susceptible animal species and humans. Australia’s rapid detection and transparent reporting demonstrate the value of strong surveillance systems and international cooperation. As HPAI continues to evolve and spread across regions and species, timely information sharing, scientific collaboration and sustained preparedness remain essential to protect animal and public health. Transparent reporting is also critical to maintaining trust, supporting evidence-based decision-making and preventing misinformation and disinformation.
Source:
Link: https://www.woah.org/en/australia-notifies-first-case-of-high-pathogenicity-avian-influenza-h5n1-in-a-wild-bird/
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