Mycoplasma bovis

Mycoplasma bovis is a bacterial infection of cattle. It poses no food safety risk and very low risk to human health. However, it is important as it is production limiting, hard to treat as it causes unresponsive mastitis, and is hard to test for.

Latest Update from MPI


Mycoplasma bovis response MPI Stakeholder update 279 – 16th December 2021. To date, there have been 269 Confirmed Properties, 3 of which remain active. 3 under a Notice of Direction & 96 under Active Surveillance.

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M. bovis and mating


M. bovis presents many questions about what to do this mating season. Specifically, around the risks associated with bringing bulls onto your property and joining them with your herd/heifers versus moving to a full AI system. This article provides more information on the considerations that need to be made.

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M.Bovis myth busting

angus in cattleyards

Many farmers are going through a challenging time with the M.bovis outbreak. Unfortunately, their stress is being compounded by some misinformation. Here we dispel some of those myths.

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M. bovis - What to look out for

angus cattle herd

Mycoplasma bovis is an unwanted organism in NZ. It is important for all farmers to contact their veterinarian and/or MPI if they see the following unusual signs in their herd.

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RFID Numbers


Follow the link and scroll down this page to a list of RFID (radio frequency identification) ear-tag numbers from farms under Restricted Place Notices. Any farm that is under a Restricted Place notice is unable to move or trade any stock.

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M. bovis - FAQs


Mycoplasma bovis is a bacterium that lives in cattle. Until recently, we have not had M. bovis in NZ although other mycoplasma species are recorded in cattle and other farmed animals. Follow this link to FAQs.

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Testing replacement heifers

test replacement heifers for m.bovis

A common route of introduction of Mycoplasma bovis infection onto dairy farms has been the return of replacement heifers that were infected while they were reared and bred at a grazing property.

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