More suspected bird flu cases have been identified as authorities warn it is "extremely likely" the deadly strain is spreading locally.
Eleven birds have been discovered in South Australia as authorities wait on further analysis that is set to establish whether there has been a local transmission of the virus.
There are 27 confirmed or presumed positive detections of H5 bird flu in Australia across four states to date.
All have been wild seabirds found in coastal locations.
The latest suspected cases were found in SA - seven in the state's southeast and another four on Kangaroo Island.
Results are expected by Thursday for analysis on the virus' genetic makeup that will look at how the cases are related to detections overseas and across Australia to determine whether they are isolated.
SA Primary Industries Minister Clare Scriven said on Wednesday a localised distribution of the virus was "extremely likely".
"What we've seen around the world is we can't stop H5 bird flu and there has of course, in every other continent around the world, been local transmission," she told reporters in Adelaide.
"So it was pretty much inevitable that it would occur.
"We'll wait for the scientific definitions to say whether we are considered to be at that point now but certainly if we're not it's likely that it will be quite soon."
There have been no detections of H5 bird flu in poultry, captive birds, or pets and other wildlife or livestock, and no evidence of any mass mortality events to date.
