UPDATED: The Ministry for Primary Industries is accelerating its tracing and surveillance programme so a decision whether to proceed with Mycoplasma bovis eradication can be made as soon as possible.
It has urged any dairy and beef farmers who believe they may have animals at high risk of infection to make contact immediately.
"Right now, we need to hear from any farmers who have bought cows and calves or milk for calf feed from farms that have been publicly identified as infected. If these farmers haven't already heard from us through our tracing work, we would dearly like to hear from them," director of response Geoff Gwyn said.
The MPI was particularly interested to hear from those who had received cattle or calves from Southland-based Southern Centre Dairies Ltd at any time after January 1, 2016, and had not already been contacted by the MPI.
It also needed to hear from farmers who had used milk from Southern Centre Dairies for calf feed in that same period.