Australia confirmed its first mainland case of H5 bird flu, marking the deadly virus’s arrival on every continent.
Australia has confirmed its first case of H5 bird flu on the mainland, a detection that means the deadly virus has now reached every continent on the planet. The strain turned up in a dead migratory seabird in a remote part of Western Australia. Agriculture Minister Julie Collins announced the finding at a press conference in Canberra, and said there was no evidence of any infection in poultry at that stage.
The virus was confirmed by the CSIRO Australian Centre for Disease Preparedness in a single brown skua found at the Cape Le Grand area, east of Esperance, on the state’s southern coast. Authorities were also testing samples from a sick giant petrel from the same region after an early positive result at a state laboratory. Both are migratory seabirds that sometimes visit southern Australia.
H5 Bird Flu Outbreak Triggers Poultry Lockdown in Western Australia
The detection prompted a quick response from the agriculture sector. Chicken producer Inghams put its Western Australia operations into a complete lockdown after the H5N1 strain was confirmed in the state. Housing orders now require poultry keepers to confine their birds indoors to keep them away from wild birds.
Officials stressed that the finding does not change Australia’s status as free from highly pathogenic avian influenza in poultry under international standards. The Australian Centre for Disease Control said H5 bird flu poses a low risk to public health because it rarely infects people. Food Standards Australia and New Zealand added that properly handled and cooked chicken meat and eggs are not a food safety concern.
Collins said the virus causes severe illness and high death rates in birds. Infected flocks can experience sudden death, sharp falls in egg production, swelling of the head and neck, breathing problems, and at times neurological signs such as loss of coordination. She also noted the country had long expected the virus would eventually arrive.
H5 Bird Flu Outbreak Raises Concern for Wildlife and Global Food Supply
Scientists say the way the virus reached Australia points to wildlife movement across the Southern Ocean. Jane Younger, a senior lecturer at the University of Tasmania’s Institute for Marine and Antarctic Studies, said vulnerable seabird colonies and Australian fur seal populations were a particular worry, and described the development as serious for the country’s wildlife.
The damage elsewhere shows what the strain can do. An H5 outbreak that began around August 2025 on Heard Island and McDonald Islands, remote Australian territories far southwest of Perth, killed more than 13,000 southern elephant seal pups, over three quarters of the breeding group, along with hundreds of adult king penguins. In the United States, the virus has been reported in more than 700 dairy herds in California alone and has spread to at least 16 states since first appearing in cattle in 2024.
Human cases remain uncommon and are mostly tied to close contact with infected animals. No sustained spread between people has been confirmed. Even so, the arrival of the virus on the mainland has shifted Australia’s focus toward wild bird surveillance and on-farm biosecurity, with commercial poultry operations seen as the main risk if the strain crosses into the domestic food system.
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