Bird flu spreads into Australian wildlife as seven new cases detected in seabirds

Seven dead and dying seabirds have turned up along South Australia's Limestone Coast, and what they carry has shifted the nature of the crisis. All were greater crested terns—common local birds—found at three locations within a tight geographic band: one at Cape Jaffa, five clustered around Southend Jetty near Beachport, and one at Port MacDonald, just over twenty kilometers from the Victorian border. The birds tested positive or are suspected positive for H5 bird flu, a disease that until now had arrived in Australia as a passenger on migratory seabirds from distant breeding grounds. Now it appears to be taking root.

Kate Millar, chief executive of BirdLife Australia, framed the shift in stark terms. The initial infected birds—those subantarctic visitors that first brought the virus—were like embers from a distant fire. Finding it now in crested terns, birds that live and breed here year-round, was smoke. It meant the disease was no longer just passing through; it was establishing itself in local populations. "Governments have been saying it hasn't spread," Millar said. "This is evidence of spread."

The seven suspected cases follow two confirmed detections in greater crested terns over the weekend, including the first positive case found within metropolitan Adelaide itself. If the CSIRO laboratory confirms all seven, South Australia's total will reach fourteen cases, with ten of those concentrated in local greater crested terns. Of the five birds collected from Southend Jetty, four were alive but visibly sick; one was dead. The birds from Cape Jaffa and Port MacDonald were both deceased.

State officials acknowledged the gravity. Clare Scriven, South Australia's primary industries minister, called the development concerning. Dr. Skye Fruean, the state's chief veterinary officer, cautioned that it remained too early to determine whether the five birds at Southend Jetty represented a true cluster—birds infecting one another in the same location—or separate incidents. Still, the government announced it would intensify monitoring efforts, including targeted surveillance of areas where greater crested terns congregate. One reassuring note: all detections so far have been in wild seabirds. No cases have appeared in poultry or agricultural operations.

What worries experts most is the calendar. Spring breeding season approaches, and that is when the real danger emerges. Greater crested terns nest in colonies and roost in massive flocks, creating what Millar called "a real engine room of viral spread." As sick birds come into contact with healthy ones—and as they interact with other coastal and wetland species—the virus can radiate outward into new habitats and new bird populations. The concern extends to endangered fairy terns, whose colonies nest nearby and have been the focus of years of community protection work.

Federal Agriculture Minister Julie Collins emphasized that samples were being rushed to the CSIRO laboratory to determine whether local transmission had truly begun. She stressed that no mass bird die-offs had been recorded, and that no H5 cases had appeared in Australia's poultry or agricultural systems. The risk to human health remained low. Yet her language also carried a note of caution: it was "critically important" not to jump to conclusions before the lab results arrived.

Carol Booth, policy director at the Invasive Species Council, articulated what hangs in the balance. If these seven cases represent local transmission—birds spreading the virus to other birds within Australia rather than arriving as isolated infected individuals—then the country enters "a very different phase of this outbreak." The response would need to shift from managing imported disease to containing a spreading epidemic in wildlife. For now, authorities urged the public to report any sick or dead birds without touching them, and to call the Emergency Animal Disease Hotline. The waiting begins for the CSIRO results.