

The disease is widespread over the northern half of the North Island with cases diagnosed as far south as Taranaki, the King Country, Whanganui and Hawkes Bay.
Cases of Theileriosis have also been confirmed in parts of the South Island - Canterbury, West Coast and Marlborough. More cases are likely, especially in Nelson/Marlborough as ticks are present in the north of the South Island.
Theileriosis could be affecting your cows if you farm in tick-infected areas, or if your cattle have been shifted into or out of tick-infected areas.
- Theileriosis only affects cattle and is transmitted by cattle ticks
- Theileriosis causes anaemia in cattle and can sometimes be fatal
- Cows during calving and young calves (2-3 months) are at most risk from infection
- There are no human health or food safety risks associated with Theileriosis.
The best way of minimising the impact of Theileriosis is by good stock management and by reducing stress as much as possible. Applying a tick control product during high risk periods can assist.
If you suspect a case of Theileriosis, contact your veterinarian for advice.
For more information:
- Short guide to Theileria - A guide for farmers working with their veterinarian in managing Theileria
- Seasonal Theileriosis management
- F.A.N.I card
- Theileria and anaemia in cattle - Fact Sheet #1 - The facts for farmers
- Theileria and anaemia in cattle - Fact Sheet #2 - Understanding the risk
- Theileria and anaemia in cattle - Fact Sheet #3 - Detection and treatment
- Theileria and anaemia in cattle - Fact Sheet #4 - Managing Theileria infection
- Theileria and anaemia in cattle - Fact Sheet #5 - Ticks and Theileria
- DairyNZ advisory to farmers