Ceva Animal Health is urging vets to encourage their farming clients to test for enzootic abortion of ewes (EAE) if they have experienced an abortion rate of over 2% in their flock or if two or more have aborted over two to three days irrespective of the size of flock.

The company has published data from its 2021 Assure Ewe subsidised testing scheme, which found that 48% of farms that submitted samples after last year’s lambing season tested positive for EAE1 caused by Chlamydia abortus.

This, Ceva says, mirrors the results from the 2020 testing initiative, demonstrating that EAE remains a significant issue on UK farms.

Katherine Timms BVetMed (Hons) MRCVS, ruminant veterinary advisor at Ceva Animal Health said: “EAE is a significant problem on UK farms, and it can be exceptionally expensive and frustrating to deal with, as infected sheep aborting and shedding have the potential to cause an abortion storm the following year.

“Any abortion outbreak should therefore be identified and managed as quickly and effectively as possible to help prevent the rest of the ewes in the flock from becoming infected.

"Vaccination and strict biosecurity provide the best protection against EAE and farmers can vaccinate their ewes from five months of age until four weeks prior to tupping, as long as the ewe is not in lamb.”

For further information, contact your local Ceva Animal Health account manager or visit www.enzooticabortion.co.uk.


  1. Ceva Animal Health’s Assure Ewe initiative tested 600 sheep in 2021

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