Australia to vaccinate vulnerable native birds against H5N1 bird flu

Aug 10, 2026

Australia is launching an AU$2 million vaccination campaign to protect its unique native bird populations from the deadly H5N1 avian influenza. Following the country's first mass seabird deaths in late July 2026, the targeted rollout will focus on high-risk captive species and vulnerable wild populations. In Victoria, authorities plan to vaccinate up to 5,000 little penguins on Phillip Island, marking the world's largest wild bird vaccination effort. With 45% of Australia's bird species being endemic, conservationists warn the virus poses severe extinction risks.

Australia H5N1 vaccination programme

▪Australia will begin vaccinating vulnerable native bird populations in captivity against the lethal H5N1 strain of avian influenza in the coming days and weeks.
▪The Australian federal government has purchased AU$2 million worth of H5N1 bird flu vaccines from overseas, which equates to approximately 1,500 vials.
▪The Australian bird flu vaccination program will target priority native species identified by states and territories based on their vulnerability and potential conservation impact.

Phillip Island penguin vaccination logistics

▪Phillip Island Nature Parks will corral the little penguins into a small pen to administer the bird flu vaccine and implant a microchip in each animal.
▪The bird flu vaccine requires two doses administered three to four weeks apart, which will require teams to intercept and corral Phillip Island penguins during their daily migrations.
▪Victorian authorities plan to vaccinate up to 5,000 wild little penguins from Phillip Island in the coming weeks, which they state will be the largest vaccination of wild birds globally.

H5N1 spread in Australia

▪More than 200 confirmed cases of H5N1 bird flu have been recorded in Australia, with the spread among local birds restricted to New South Wales, Victoria, and South Australia.
▪Australia reported its first case of the highly contagious H5N1 bird flu strain in June 2026, making it the last continent to be impacted by the virus.
▪Genetic sequencing by the Australian Centre for Disease Preparedness indicates that the H5N1 virus was introduced to mainland Australia six or seven times, likely originating from Heard Island and McDonald Islands.

Mass mortality events

▪Worst-case scenario modeling suggests that a six-week H5N1 outbreak on Phillip Island could result in the deaths of 8,000 to 16,000 little penguins.
▪The first mass mortality event of the H5N1 outbreak in South Australia occurred at Baudin Rocks near Robe, where more than 80 dead and sick greater crested terns were spotted.
▪Australia recorded its first mass seabird mortality event from H5N1 bird flu in late July or early August 2026, after the virus spread from migratory birds to local native species.

Volunteer bird flu monitoring network

▪More than 120 volunteers have joined the Bird Observers Network in South Australia to help identify and report sick birds showing symptoms of H5 bird flu.
▪The Bird Observers Network is a collaborative partnership between the South Australian government, Conservation Council SA, Birds SA, and Birdlife Australia.

Endemic species conservation risk

▪Approximately 45 percent of Australia's 850 bird species are endemic, meaning they are unique to the country and found nowhere else on Earth, leaving them highly vulnerable to H5N1.
▪An Australian government risk assessment of more than 2,000 native birds and mammals identified a handful of species facing possible extinction and hundreds facing severe population reductions from H5N1.