The H5N1 avian influenza virus has been detected in a common dolphin in South Australia for the first time, marking an escalation of the wildlife outbreak as researchers are evacuated from a sub-Antarctic island due to psychosocial risks.
According to reports from Australian news outlets, South Australia recorded 46 new wildlife H5 bird flu events on Friday, including the dolphin infection. Other species recently succumbing to the virus in the state include a fox, an Australian raven, and a brown falcon, which represents the first Australian detection of the H5 strain in a bird of prey.
Macquarie Island Staff Evacuation Over Mental Health Risks
The Australian Antarctic Division announced it will withdraw its staff from Macquarie Island, located halfway between Tasmania and Antarctica. According to Department of Climate Change, Energy, Environment and Water deputy secretary Sean Sullivan, the precautionary extraction protects the psychological wellbeing of the 24 expeditioners living and working on the World Heritage-listed island.
Government projections warn of a high likelihood of a significant mortality event during the upcoming breeding season for the island’s animal populations. Macquarie Island hosts more than 80,000 southern elephant seals and millions of breeding seabirds, including multiple penguin species. Elephant seals have demonstrated vulnerability to the H5 virus elsewhere in sub-Antarctic territories, such as Heard Island and McDonald Islands, where pup mortality rates exceeded 90 per cent in some colonies.
Mr Sullivan told the Australian Broadcasting Corporation that an outbreak on Macquarie Island would trigger thousands of deaths, trapping staff on base amid severe distress, long-term air quality impacts, and mass mortality events. Australia’s icebreaking research and supply vessel, the RSV Nuyina, will sail to the island in early October to extract workers and essential cargo.
While the federal government maintains that the risk of the H5N1 virus to human health remains low, state and federal agencies are shifting containment and monitoring strategies. In South Australia, reporting protocols have updated so that cases are confirmed upon local laboratory testing in Adelaide, bypassing the previous process where most samples were sent to the CSIRO’s Australian Centre for Disease Preparedness in Geelong.
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