South Australia confirms H5 bird flu on Limestone Coast

South Australian authorities have confirmed an H5 bird flu outbreak on the Limestone Coast, describing it as a sharp escalation in the virus’s impact on regional wildlife. Officials said the outbreak follows the initial detection of the virus in a greater crested tern in early July and has since expanded across the region.

Since that first finding, the Limestone Coast has recorded dozens of suspected and confirmed cases. Authorities also reported a mass mortality event at Baudin Rocks, adding to concerns about rapid spread among wildlife in coastal habitats.

How the virus is moving through coastal wildlife

Officials said transmission risk is being amplified by the high commingling rates of crested terns with other birds. The species is frequently in close contact with gulls, cormorants, and ducks, which increases the likelihood of the virus passing between different avian groups.

That close proximity is creating a high-risk environment for nearly 400 native species in the region, including threatened fairy terns. Authorities also warned that marine mammals may be exposed, including Australian sea lions and fur seals.

Carcasses and operational strain as cases mount

Officials said infected carcasses left in the environment can intensify risk for scavengers, adding another pathway for wildlife exposure. The ongoing presence of deceased birds is also contributing to broader environmental contamination concerns tied to the outbreak.

Local conservation groups and veterinary clinics said they are operating under significant strain as response measures expand. They reported implementing mandatory personal protective equipment and quarantine protocols to reduce infection risk while handling animals.

Wildlife carers said the growing volume of affected animals is outpacing available resources. They also flagged the practical difficulty of managing contamination associated with dead birds as the outbreak continues.

Officials expect disruption as spread reaches Victoria

With the virus now spreading into Victoria, federal and state officials said they anticipate a prolonged period of ecological disruption. The current response is focused on surveillance and reporting as authorities track suspected and confirmed cases and monitor the outbreak’s footprint.

Officials have not detailed how quickly conditions may improve, and carers said uncertainty remains about whether additional support will be made available to manage workload and risks in the field. For now, authorities and responders are continuing monitoring while attempting to contain impacts on wildlife across affected coastal areas.