Australia Confirms First Bird Flu Case in Local Mammal

Australia has recorded its first instance of the H5N1 bird flu virus infecting a mammal, with the discovery of the virus in a long-nosed fur seal in South Australia.

The seal was found deceased at the coastal town of Beachport, showing no signs of injury. Authorities noted that its death does not appear linked to other sick or deceased marine mammals in the area. This marks a significant development in the ongoing avian influenza outbreak that began in June.

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Its death does not appear to be associated with other sick or dead marine mammals.

Federal Agriculture Minister Julie Collins stated that once the H5 bird flu spreads within the natural environment, significant losses become unavoidable. Australia has already witnessed mass deaths among seabirds attributed to the virus in August, an escalation from its initial detection in migratory birds before spreading to native species.

To date, nearly 300 cases of the virus have been confirmed across the country. While the virus has not yet impacted Australia's poultry or agricultural sectors, the nation was the last continent to report bird flu. The virus was previously detected in late 2025 on the sub-Antarctic territory of Heard Island, where it reportedly killed over 13,000 baby seals.

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Once the H5 bird flu is spreading in the natural environment it is not possible to avoid significant losses.