A chicken farm in the New South Wales Hunter Valley is in lockdown due to a suspected case of avian influenza.
The Department of Primary Industries says about 50,000 birds will be destroyed after test results confirmed the virus to be the H7 strain, not the H5N1 strain which has gained worldwide attention.
The ABC understands the property is near Hinton.
DPI chief veterinary officer Ian Roth says the virus does not impact humans but is highly pathogenic for birds.
"The H7 is one of the ones that we do worry about basically because it kills lots of birds not for other reasons," he said. "But now they will need to destroyed, they will be destroyed humanely on this farm.
"Certainly with the H7s, the NSW Food Authority and NSW Health don't consider that from eggs or poultry products that there are human health concerns."
Mr Roth says it does not look like the virus has spread.
"We've started tracing to see if it could have possibly spread, and so far that's looking quite good," he said. "It looks like there's not a lot of potential movements for problems.
"But that's why we've got it locked down and our first response team activated."
Mr Roth says the farm's owners raised the alarm after a number of birds died earlier in the week.
"And it's kept going and there's been significant mortality, so the vet that looked at that was suspicious and hence submitted the samples for testing," he said.