In a blow to New Zealand farmers everywhere, MPI discovered Mycoplasma bovis in Canterbury's Selwyn.
It's just months after the announcement the country had no known cases of the cattle disease.
A standard bulk tank-milk background screening picked up the infection.
The Country's Jamie Mackay says the news that 1000 dairy cows will have to be culled will be devastating for the farmer impacted.
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Perspective with Andrew Dickens: Will the CRL be worth the wait?
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