Theileriosis is a disease caused by a species of Theileria – a blood-borne parasite. It only affects cattle and is primarily transmitted by ticks. Theileria is a widespread disease with an increasing number of cases in the northern parts of the North Island. We have witnessed news cases appearing in the geographical area covered by Franklin Vets.



To become infected by Theileria, a cow must be bitten by a tick carrying the disease. It is not spread by direct animal to animal contact. Cattle can be infected with the Theileria parasite without necessarily showing any signs of clinical disease.

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Control and Prevention

Theileria Outbreak

Cattle are at risk of infection when moved to areas where infected ticks are present. Infected animals can also spread infection to ticks when transported to new areas. This, in turn can spread disease to uninfected animals.

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Theleiria treatement blood transfusion

Once the diagnosis of theileriosis is made, the most appropriate treatment depends on a variety of aspects including the clinical signs, the number of affected animals and feed availability.

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Herd Movement Assessment

herd of cows

If you are moving animals from one property to another it is paramount that you try to assess the risk you face of running into problems.

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