Enzootic Abortion of Ewes what is it?

Enzootic Abortion of Ewes (EAE), is caused by the bacteria Chlamydophila abortus. It is the most commonly diagnosed cause of abortion in UK sheep1, costing the UK sheep industry up to £20 million annually2.

Infection is primarily spread through the aborted material and reproductive fluids of infected ewes, and bacteria can be shed for up
to 3 weeks after abortion3.

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There are many potential ways that EAE infection can enter a flock4:

Bought in/replacement ewes

Environment (the bacteria can last weeks in cold conditions)
Neighbouring flocks (if grazing adjoining land)
Escaped sheep

Estimated cost per abortion £85

Check the map to see the number of farms tested positive in your area

Ceva offer farm testing for Chlamydophila abortus. The number of farms that record a positive case of EAE are recorded by county on the map on the right.
Check the number of farms in your area by clicking on your county

Keep checking back as we update the results regularly.

These reports are based on testing done through our Assure Ewe programme in 2017-20. In reality, the true number of EAE abortions and cases on farm may be much higher and widespread.

If there are no farms shown in your county, or you think there are farms not shown, check also with your vet.

What can you do to help protect your farm?


Ewes can be tested for Chlamydia within 3 months of lambing. Contact the practice for more information.


Vaccination along with strict biosecurity is the best protection against the impact of EAE, and can be done from 4 months to 4 weeks prior to tupping.


For more information on vaccination, please contact your vet.

For more information on testing, please contact your vet, Ceva Animal Health or fill out the form and we’ll be in touch.

  • Tel: 01494 781510
  • www.ceva.co.uk

Ceva Animal Health
Unit 3, Anglo Office Park, White Lion Road,
Amersham, Bucks HP7 9FB.