Australia Confirms First Detection of Dominant H5N1 Strain in Wild Seabirds

Australia detected H5N1 clade 2.3.4.4b in two wild seabirds in Western Australia in June 2026. This is the dominant global strain that has driven mass mortality across Europe, the Americas, and Antarctica. Migratory seabirds carried it across transoceanic routes to Australia's southern coast—a pathway biosecurity controls cannot intercept. No poultry flocks are affected yet, but spillover risk remains.