First mammal case confirmed
Australia has recorded its first case of H5N1 bird flu in a mammal, a long-nosed fur seal found at Beachport in South Australia, about 300 kilometres south of Adelaide. Federal Agriculture Minister Julie Collins confirmed the case on Sunday, describing the development as "sadly our first confirmed case of H5 bird flu in a mammal in Australia." The seal was found dead with no signs of injury, and the infection is believed to have occurred through exposure to infected wild birds or a shared environment.
The announcement came as authorities reported five suspected H5 bird flu cases in South Australia on Monday, including a second long-nosed fur seal at The Pages Conservation Park, a breeding ground for the endangered Australian sea lion. Results for those cases are expected in the coming days.
Response and vaccination efforts
In Victoria, a vaccination program for little penguins is underway, with more than 1,000 birds having received their first dose of an H5N1 vaccine at Phillip Island and St Kilda. Authorities plan to vaccinate about 5,000 little penguins, with each bird receiving two doses. Phillip Island Nature Parks chief executive Catherine Basterfield described the effort as "the first time anyone around the world has attempted something like this at this scale." The island is home to about 40,000 little penguins, the world's largest colony.
Environment Minister Jaclyn Symes said the vaccination program aims to give the colony the best possible protection. "We know that bird flu is here, we know we can't stop it but we want to put the penguin colony in the best possible place to ensure that they are protected as much as possible," she said.
The federal government has also been investigating whether vaccines are available for marine mammals, with Agriculture Minister Julie Collins noting that trials are underway in North America.
Spread and impact
The H5N1 strain, which arrived in Australia in June, has now been detected in almost 300 events across wild birds nationwide, according to government figures. As of August 22, South Australia had the highest number of cases with 183, followed by Victoria with 86, NSW with 11, Western Australia with 10, Tasmania with seven, and Queensland with one. The most affected species are greater crested terns, silver gulls, and giant petrels.
A little penguin on Kangaroo Island was also confirmed to have contracted the virus on Sunday, and a little penguin from Phillip Island died from the strain earlier in August.
Environment Minister Murray Watt said mass mortalities of birds and mammals are likely. "We are likely to see mass mortalities of birds and mammals, and I know that is a very distressing thing for Australians to hear," he told ABC TV. "This is what we've seen happen overseas. Australia is very fortunate that we've been the last continent on Earth to have this strain of bird flu happen."
Threats to iconic species
Experts have warned that the virus could have a devastating impact on Australia's unique wildlife. Invasive Species Council chief executive Jack Gough said the country could see lakes without black swans "or large numbers of carcasses on the shore," and warned of the potential loss of iconic species.
Black swans have been ranked at "very high risk" from bird flu in a national risk assessment, and University of Queensland virologist Kirsty Short said the birds are an "indicator species" because they are more likely to die once infected. Ornithologist Floyd Holmes said that while the virus may not wipe out all swans, local populations that congregate in one place could be lost entirely.
The endangered Australian sea lion, with a population of less than 12,000, is also at risk. Antarctic ecologist Jane Younger said that if the virus reached the species, it could threaten it with extinction. Curtin University associate professor Bill Bateman said Australia should expect a "mass die-off" of marine mammals similar to those seen in South America and Heard Island.
Sean Dooley of BirdLife Australia said "potential extinction from the disease is possible for some birds," and called for an effective response to mitigate losses.
Government and expert responses
The federal government has spent more than $100 million on bird flu preparedness, including $2 million on vaccines for priority species. However, experts have questioned whether enough was done to prepare native species for the virus.
Agriculture Minister Julie Collins said the government was examining whether further vaccination programs were needed and that it was not possible to avoid significant losses once the virus is spreading in the natural environment. She also noted that there is no evidence of infection in poultry or agriculture, and the risk to human health remains low.
State and federal leaders are expected to meet in coming days to discuss the crisis.