Dead dolphin in South Australia tests positive for bird flu
A dead common dolphin that washed ashore at Encounter Bay, on South Australia’s Fleurieu Peninsula, has tested positive for H5 bird flu. South Australia’s chief veterinary officer, Dr Skye Fruean, confirmed the case this week, saying the dolphin had most likely picked up the virus through a chance encounter with an infected wild bird.
Dr Fruean said there was a low risk of a wider outbreak among dolphins, but officials remain concerned for land-based sea mammals such as seals and sea lions. She also said recent cases had not shown signs of mass mortality, and that positive detections were becoming less frequent, though they were still appearing regularly. Crested tern populations have been hit hardest.
The case takes South Australia’s total to 340 confirmed H5 bird flu events, according to VidiaNews. National data from Australia’s Department of Agriculture, Fisheries and Forestry counted 728 events across the country as of 30 October, with 339 in South Australia before this latest case. An event can cover one or more animals at a single location. Australian authorities have said the risk to people remains low, and no cases have been found in poultry or livestock.
A vaccination programme for captive birds has finished at Cleland Wildlife Park and is about halfway done at Zoos SA sites. The federal government has also confirmed vaccines for a programme to protect wild little penguins at Granite Island, Penneshaw and Emu Bay, though no start date has been announced yet.
Why it matters
Bird flu arrived in Australia only in June 2026, and it has already spread from wild birds into seals, a fox and dolphins. Each new mammal case matters, because the virus can change as it moves between species. Dolphins are a particular worry, because they feed and travel in close groups, where a virus could spread quickly once it takes hold.
What happens next
Wildlife officers will keep testing dead and sick animals and tracking new events across the state. The little penguin vaccination programme is expected to begin once preparations at the three colonies are complete. Officials say the pattern so far points to scattered cases rather than a mass die-off, but they are watching seals and sea lions closely.
This article is for general information and education only. It is not legal or financial advice.
Sources
- https://vidianews.com/news/11792-dead-dolphin-tests-positive-for-h5-bird-flu (VidiaNews, 31 October 2026)
- https://www.agriculture.gov.au/campaigns/birdflu/latest-data (Australian Department of Agriculture, Fisheries and Forestry, 30 October 2026)
- https://www.ava.com.au/resources-hub/emergency-and-disaster-response/high-pathogenicity-avian-influenza (Australian Veterinary Association, 29 October 2026)
