The Prime Minister's buoyed by news Mycoplasma bovis is all but eliminated in New Zealand

But she's not claiming total victory yet.

M. Bovis has been cleared from 271 farms ... but the disease remains on one property.

Jacinda Ardern says there's more work to be done.

She says the Government is expecting to see re-infection and the really extensive surveillance regime is in place to show any other sites of interest.