Earlier this week, several breeding female pigs on the farm at Cosgrove, east of Shepparton, tested positive to Influenza A, H1N1.

The Department of Primary Industries (DPI) has been monitoring pigs at the farm, reports ABC.

Chief veterinarian Dr Hugh Miller says the virus does not seem to be spreading among the pig population. However testing is continuing.

"Once there's been a week passed where there's been no pigs with flu-like signs on the piggery, then we'll start to be much more confident that it has disappeared," he said.

"We do what we call proof-of-freedom testing after that, to be confident that the disease is gone," he said.

The swine flu diagnosis is expected to be confirmed in test results this afternoon.

"But I need to say they don't change the situation, they just give us confirmation that what we believe is the case, in fact is the case."