A suspected bird flu case has now been found in NSW. Here’s what that means

A suspected case of H5 bird flu has been detected in a giant petrel found near Hawks Nest on the mid-north coast of New South Wales, marking the first time the virus has been identified in a wild bird within the state. Preliminary test results indicate the presence of the virus, and samples have been forwarded to the Australian Centre for Disease Preparedness for further confirmation. This discovery coincides with an unconfirmed positive result in Western Australia, suggesting that Australia may soon confirm its sixth and seventh instances of highly pathogenic H5 avian influenza within a span of less than three weeks. Previously, cases had been recorded in wild birds in Western Australia and South Australia starting from June 14.

The detection of the virus in New South Wales is not unexpected given the migratory patterns of giant petrels. These birds typically spend their winters in areas surrounding Australia, where they scavenge in southern waters. During this period, they might contract the disease and subsequently spread it across a wide range. In response to this development, authorities in New South Wales are implementing similar measures to those previously enacted in Western Australia. These include increased surveillance efforts, enhanced biosecurity protocols on poultry farms, and public advisories urging individuals to refrain from approaching sick or deceased birds. Instead, the public is encouraged to report such sightings to the Emergency Animal Disease Hotline (1800 675 888).

NSW Agriculture Minister Tara Moriarty expressed concern regarding the implications of the detection for both agricultural sectors and wildlife conservation. Chief Veterinary Officer Jo Coombe emphasized the importance of early detection, highlighting the establishment of a State Coordination Centre in Orange and the training of over 500 additional personnel dedicated to surveillance activities. Despite these proactive steps, it is important to note that a single detection in a wild bird does not constitute an outbreak. An actual outbreak would require the virus to transition into local wildlife populations and begin spreading among them. To date, all confirmed cases have been limited to wild migratory seabirds without evidence of transmission to domesticated poultry or native species.

While current data suggests that the virus has not yet reached the stage of widespread dissemination within Australia, there remains a potential risk for future outbreaks. Migratory birds have historically played a pivotal role in initiating localized outbreaks in new regions. Given that giant petrels are anticipated to remain in southern Australia for approximately two months, further detections during the winter season could be plausible. Even for regions currently free of the virus, controlling its spread presents significant challenges due to the uncontrollable nature of the wild animal carriers. Therefore, the emphasis lies on ensuring Australia's readiness for any eventual outbreak through existing national response plans developed since 2024, along with strategies focused on wildlife and poultry monitoring, biosecurity standards, and outbreak simulations.

The threat posed by H5 bird flu extends beyond terrestrial ecosystems, posing risks to marine mammals such as seals. With populations of fur seals residing in New South Wales, the potential impact on these animals warrants attention. Historical occurrences abroad demonstrate the devastating effects of H5N1 on seal populations, including a 2023 incident in Argentina that resulted in the loss of over 17,000 southern elephant seal pups. Similar scenarios have unfolded in South America between 2022 and 2023, affecting tens of thousands of sea lions, and leading to beach closures in California earlier this year. Seals can contract the virus via interaction with infected birds or exposure to contaminated water, and their densely populated breeding grounds facilitate rapid viral transmission. As the number of confirmed cases increases globally, coastal seal colonies may necessitate comparable levels of scrutiny as poultry farms.

Authorities are maintaining a heightened state of vigilance amid ongoing developments related to the suspected bird flu case in New South Wales. They continue to monitor the situation closely, preparing for any potential escalation while emphasizing the need for continued awareness and caution among the public.