Australia may record its first mainland case of the deadly H5N1 bird flu after a sick migratory wild bird was found in southern Western Australia, with early tests signaling a suspected positive result.

If confirmed, the H5 strain is highly contagious among birds and mammals and can threaten poultry, though human infection is rare.

There is no evidence yet of mass mortality or widespread infection in poultry; only a single sick bird has died and a second unwell bird is undergoing testing.

The virus can spread to farm animals and domestic pets, and can contaminate clothing, shoes, and items like egg cartons.

Experts warn that even a false alarm would underscore the urgency of preparedness, clear response plans, and continued mitigation of wildlife threats as Australia evaluates readiness.

Wildlife groups warn that confirmation of H5N1 could devastate native birds, marine mammals, and broader wildlife, emphasizing the need for ongoing preparedness and robust response systems.

If confirmed as H5N1, authorities expect significant wildlife and mammal impacts, reflecting the broader global spread and seriousness of the situation.

The update was published on June 19, 2026, with the story first released a few minutes earlier.

The article notes H5N1 has spread to every other continent prior to this potential case, underscoring its global significance.

Federal Agriculture Minister emphasizes the case is not in poultry or agriculture, and Australia is not H5-free, acknowledging global spread.

Common mammal signs include weakness, breathing trouble, tremors, seizures, or walking in circles; wild birds may struggle to walk or fly, and poultry may become lethargic and lose appetite.

Public guidance urges not touching sick or dead wild birds, reporting incidents to birdflu.gov.au, and noting location from a distance.