Wildlife agencies in Australia and New Zealand are vaccinating endangered bird species to stop the spread of the H5N1 bird-flu virus.
The initiative aims to protect species on the brink of extinction from a virus that can decimate entire populations in a short window. Because many of these birds have small total populations, a single outbreak could lead to permanent loss of biodiversity.
In Australia, the Department of Climate Change, Energy, the Environment and Water is focusing its efforts on vulnerable species currently held in captivity [1, 2]. Officials said they expect to roll out these vaccinations in the coming weeks [1]. The urgency follows data indicating that approximately 20% of Australian bird and mammal species face high, very high, or extreme risk from H5N1 [3].
Across the Tasman Sea, New Zealand has already moved into the implementation phase. Wildlife officials at the Zealandia Wildlife Sanctuary in Wellington began vaccinating endangered Takahe after the country reported its first H5N1 case on July 15, 2026 [2, 4].
While the Australian program targets captive populations, New Zealand's efforts include birds in managed wild settings. Both nations are responding to the global spread of the virus, which has proven lethal to various avian species. The goal is to limit the spread among vulnerable wildlife, and create a buffer for the most threatened species [1, 3].
Wildlife experts said the efficacy of these vaccines in various threatened species is not yet fully understood. However, the risk of inaction is considered greater than the risk of vaccination given the lethality of the H5N1 strain [3].
“Approximately 20% of Australian bird and mammal species face high, very high, or extreme risk from H5N1.”
The deployment of vaccines for wild and captive birds represents a shift from passive monitoring to active intervention in wildlife management. By targeting 'sentinel' or high-risk endangered species, officials are attempting to prevent a catastrophic collapse of biodiversity that could occur if H5N1 reaches isolated island populations or small captive breeding groups.
