H5 bird flu kills fur seal in first mainland Australian mammal case
BiosecurityAccording to The SE Voice, the seal was found dead with no signs of injury and reported to the emergency animal disease hotline by a member of the public on Wednesday, 19 August. State-based testing was initially inconclusive, and samples were dispatched to the CSIRO's Australian Centre for Disease Preparedness for urgent testing, which confirmed the detection.
Federal Agriculture Minister Julie Collins confirmed the case to reporters in Hobart, telling them "This is sadly our first confirmed case of H5 bird flu in a mammal in Australia." She added that "Although this is a concerning development, it is not unexpected for us to start to see infection in other wildlife, particularly in marine mammals, particularly in areas where there are high infection rates in wild birds." Collins said she had been advised the detection did not appear to be associated with other sick or dead marine mammals, and that infection of the individual animal was likely to have occurred due to exposure to infected wild birds or the environment they share. She said she would travel to South Australia "in the coming days" to discuss the state's response to H5 bird flu, according to ABC News.
The seal's death follows a rapid escalation in bird detections across the state. Per the South Australian government's update reported by The SE Voice, authorities confirmed 11 new H5 bird flu events in South Australia since the previous update, including the first confirmed detection in a mammal, alongside further cases in greater crested terns and little penguins across the Adelaide, Eyre Peninsula, Fleurieu Peninsula, Limestone Coast and Kangaroo Island regions. Nationally, there have now been 298 positive H5 bird flu events recorded across Australia, including 183 in South Australia, though authorities said there remains no evidence of H5 bird flu infection in Australia's poultry or agricultural production systems.
Conservation groups have seized on the case as evidence the virus is now moving into marine mammal populations the government itself has flagged as vulnerable. The Australian Marine Conservation Society warned, in comments carried by Mirage News, that long-nosed fur seals, Australian fur seals and Australian sea lions are at risk of experiencing mass mortalities due to this virus, as has occurred in other seals and sea lions overseas, pointing to the precedent set by more than 13,000 elephant seal pups killed on Australia's Heard Island earlier in the outbreak. That sub-Antarctic die-off, reported by Reuters last year, saw hundreds of dead seal pups found on Heard Island with signs that suggest they were killed by the destructive bird flu that has swept most of the planet, at a time when Australia remained the only continent free of the highly contagious virus. That status has now ended on multiple fronts, with the mainland mammal case adding to concerns about how far the virus will spread through the country's wildlife before the migratory bird season peaks.