Taranaki's first case of Mycoplasma bovis has been confirmed.
The Ministry for Primary Industries said the herd on a Taranaki property had tested positive for the disease.
A Restricted Place notice has been placed on the farm.
MPI Mycoplasma bovis director Geoff Gwyn said the M. bovis response team had worked hard to establish whether the property was at risk of being infected and had established the risk was high.
Gwyn said it was a sensitive situation and extremely trying for the farmers involved.