A fur seal discovered at Beachport in South Australia earlier this week tested positive for H5 bird flu, representing the first confirmed death of a mainland mammal from the highly pathogenic strain. The discovery came days after state officials reported multiple mass mortality events on offshore islands that killed over 1,000 greater crested terns.
Federal Agriculture Minister Julie Collins characterized the mammal fatality as anticipated rather than surprising, given the virus’s progression through the country. She indicated that the seal likely contracted the infection through exposure to infected wild birds or contaminated environments shared with such birds. Collins noted that preventing spread among wild bird populations is not feasible, and increased reports of marine mammal infections are expected as bird mortality continues. According to her account, Australia has experienced 298 documented events overall, with South Australia accounting for the majority at 183 cases.
Health authorities maintain that human transmission risk remains low but continue advising the public to avoid contact with sick or deceased birds and report sightings through designated channels. South Australia has also confirmed a little penguin found on Kangaroo Island tested positive for the virus. State environment officials are exploring whether an experimental vaccine developed in the United States could be adapted for use in Australian mammals, though regulatory approval considerations remain.
Wildlife advocates have raised concerns about potential population-level impacts. The Invasive Species Council’s chief executive warned that spread to Australian sea lion populations could constitute an extinction-level event for the endangered species. The Australian Marine Conservation Society called for the establishment of a $200 million wildlife resilience fund to address threats to vulnerable species.
In Tasmania, 51 little penguins found on King Island are presumed to have died from H5 bird flu, though officials have not classified the event as a mass mortality incident. Testing confirmed the virus in samples from one penguin, with a second sample remaining inconclusive pending further analysis.
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