H5 bird flu update

29 July 2026

The risk assessment for infection for Australian dairy cattle with the H5 bird flu (avian influenza) still remains low, despite Agriculture Victoria reporting that Victoria’s first case has been confirmed.

The disease was confirmed in a greater crested tern at Portland in South-west Victoria on 30 July, and has previously also been confirmed in Western Australia, Queensland, South Australia and New South Wales 

There have however still been no detections to date of H5 bird flu in Australian dairy cattle or other livestock. The United States remains the only country in the world where H5 bird flu has spread to dairy cattle.  

As a result, the risk to Australian dairy cattle remains low, consistent with findings from a recent risk assessment commissioned by the Australian Government and Dairy Australia. There is no evidence from the current situation that would alter that assessment.

Dairy Australia is continuing to work closely with government, industry and animal health authorities to monitor the situation. The dairy industry has convened an H5 Bird Flu Monitoring Team, bringing together Dairy Australia, Australian Dairy Farmers (ADF) and the Australian Dairy Products Federation (ADPF) to monitor developments, coordinate information sharing and support industry preparedness. 

What can farmers do now?  

Early detection and reporting remain critical to protecting Australia's livestock industries. 

Farmers are encouraged to: 

  • Review and update farm biosecurity plans  
  • Ensure existing biosecurity measures are being consistently implemented  
  • Remain vigilant and monitor livestock and wildlife for unusual signs of illness. 

Symptoms reported overseas in dairy cattle infected with H5 bird flu have included: 

  • Reduced milk production  
  • Loss of appetite 
  • Lethargy or reduced activity 
  • Thickened or abnormal milk 
  • Fever and other signs of illness. 

Dairy farmers should immediately report any sick or dead birds or wildlife, or any unusual symptoms in their herds, to the 24-hour Emergency Animal Disease Hotline on 1800 675 888. 

Helpful resources for farmers include: