Government officials say they are doing all they can to eradicate Mycoplasma bovis but there are still major concerns from farmers in the Central Otago region.
About 80 people attended a meeting held by the Ministry for Primary Industries in Alexandra yesterday.
A woman in the audience said she thought the ministry was "struggling."
"You're telling us to have confidence in who we are dealing with but the tests can't tell us if [M. bovis] is truly positive or negative."
Ministry director of response David Yard said he understood there was "pain" and "frustration."