H5N1 bird flu confirmed in Australian wildlife

By Fiona Sterling · 2026-07-10

A detection decades in the making

On 20 June 2026, CSIRO's Australian Centre for Disease Preparedness confirmed H5N1 clade 2.3.4.4b in a brown skua found in a national park near Esperance, Western Australia, ending Australia's run as the last continent with wildlife free of the strain.verifiedVerified Source: minister.agriculture.gov.au^[1] Samples from a giant petrel recovered at the same site tested positive at the Western Australia Department of Primary Industries and Regional Development laboratory, with confirmatory testing pending at CSIRO's Geelong facility.^[1]

Australian Chief Veterinary Officer Dr Beth Cookson said the result had been anticipated. Dr Cookson said the detection is being taken seriously, and that Australia has been preparing for this scenario for several years.^[1] H5N1 has driven a global animal pandemic since emerging in 1996, causing mass mortalities in wild birds and some marine mammals across multiple continents before reaching Australian shores.

How the detection was made

Western Australia's Department of Primary Industries and Regional Development carried out field sampling before sending specimens to CSIRO's Australian Centre for Disease Preparedness for laboratory confirmation.^[1] That process sits inside Australia's One Health surveillance network, which connects state and federal agencies, CSIRO, Wildlife Health Australia and industry stakeholders through shared protocols for biosecurity, laboratory testing and outbreak response.

Minister for Agriculture, Fisheries and Forestry Julie Collins said the Australian Government is well prepared for a potential outbreak of H5 bird flu, with well-established national response arrangements in place to respond to emergency animal diseases, including H5 bird flu.^[1]

Eight cases and three states by early July

Wildlife Health Australia reported on 9 July 2026 that eight confirmed or presumed H5N1 cases in migratory seabirds had been recorded across Western Australia, South Australia and New South Wales, with no evidence of mass mortalities in wildlife or any infection in poultry.verifiedVerified Source: wildlifehealthaustralia.com.au^[3] All cases involved migratory seabirds, consistent with the movement patterns authorities had long identified as the most likely route for H5N1 to reach Australia.

Acting Australian Chief Veterinary Officer Dr Sam Hamilton said on 6 July 2026 that a giant petrel found on Whitfords-Mullaloo Beach in Perth's north metropolitan area was presumed positive for H5N1, marking the seventh case.^[2] That detection widened the geographic reach of cases beyond the remote south coast.

NSW activates its response plan

New South Wales confirmed its first H5N1 case on 4 July 2026, when a giant petrel was detected near Hawks Nest.^[4] The NSW Government activated its H5 Bird Flu Response Plan the same day, issuing heightened biosecurity advice to poultry producers, recommending the voluntary housing of free-range flocks, and deploying drone and on-ground surveillance teams to monitor wild bird populations.verifiedVerified Source: nsw.gov.au^[4]

The voluntary housing measure mirrors the precautionary approach taken in comparable outbreaks overseas, where confining free-range birds reduces contact with infected migratory seabirds. NSW authorities said no poultry flock in the state had tested positive as of that date.^[4]

What the public and producers need to do now

Federal and state authorities assessed the risk to human health as low.^[2] The public advice is straightforward: avoid direct contact with sick or dead birds, do not handle carcasses without appropriate protective gear, and report any sightings to the Emergency Animal Disease Hotline on 1800 675 888.^[2]

Poultry producers have been urged to review and lift on-farm biosecurity, including limiting shed access, disinfecting equipment and monitoring flocks closely for signs of respiratory disease or sudden mortality.^[2] Australia had remained free of H5N1 in its wildlife partly because it lacks the main duck migratory pathways connecting the continent to Asia or Antarctica, though the arrival of infected seabirds has shown that isolation is not absolute. Wildlife Health Australia confirmed the case count stood at eight across three states as of 9 July 2026.^[3]

Fiona Sterling

Fiona Sterling covers superannuation, tax and personal finance for Bushletter. She translates complex money rules into plain English.