Surveillance of Equine Strangles (SES) is a new project based at the Animal Health Trust.

Our laboratory network collates data from UK diagnostic laboratories on positive diagnoses of Strangles. Findings are summarised quarterly and shared below.

Click here to view the Surveillance of Equine Strangles interactive web tool

Funded by the Horse Trust and South Essex Insurance Brokers, SES is investigating where in the UK Strangles is occurring through laboratory confirmation of the causative bug behind Strangles, a bacteria called Streptococcus equi (S. equi).

The ability to recognise where in the UK Strangles is being diagnosed allows for owners and vets to increase their vigilance and biosecurity/hygiene measures when they know that they are in, or are travelling to a higher risk area. Not only do we want to help contribute to research into Strangles but one of our key aims is to share our findings with the equine industry to help keep the UK’s horses and ponies, happy and healthy and to reduce the spread of Strangles.

Q4 2019 Summary (October – December)

Strangles laboratory diagnoses from Q4 2019

Horse owners, vets and paraprofessionals can now access the most up to date information on Strangles diagnoses from across the UK at the click of a button using a new online resource from the Animal Health Trust, which is part of a larger surveillance project funded by the Horse Trust charity and supported by insurance brokers SEIB.

The new website, from the Surveillance of Equine Strangles project, is a huge step forward in the sharing of information about this pernicious disease. It will quickly become a vital tool for people owning and working with horses, especially those travelling around the country to areas which have seen higher rates of diagnoses of Strangles.

Find the new resource here.

Download Q4 2019 graphic

Q3 2019 Summary (July – September)

Strangles laboratory diagnoses from Q3 2019

Between July and September 2019 there were 74 laboratory confirmed diagnoses of Strangles across the UK, from samples submitted by 54 veterinary practices.

Encouragingly, where information was provided, 28% (n=13) of samples that had a reason for sampling were from horses that were being screened post Strangles infection. Horses are typically screened around four weeks after they have recovered and stopped showing clinical signs. Through these 13 horses being identified as still infected, vets have been able to treat them and prevent them from becoming carriers and further spreading Strangles.

To find out more about post outbreak screening click here.


Download Q3 2019 graphic

August 2019 Outbreak Map

Strangles laboratory diagnoses from August 2019

July 2019 Outbreak Map

In July 2019 there were 34 positive diagnoses of S. equi across the United Kingdom reported by the SES Laboratory network. The summer months see a rise in horses travelling and mixing at events, with this in mind it is important to remember to follow biosecurity guidelines to help reduce the spread of strangles and other infectious diseases.

Find out how you can take action to keep your horse happy and healthy here.

Q2 2019 Summary (April – June)

Strangles laboratory diagnoses from Q2 2019

Between April and June 2019 there were 89 laboratory confirmed diagnoses of Strangles across the UK, from samples submitted by 48 veterinary practices. The number of laboratory diagnoses of S. equi in Q2 is lower than the previous quarter, where 118 diagnoses were reported. Given the increasing number of equine influenza (EI) diagnoses made in Q2, veterinary focus when attending horses with non-specific signs of respiratory disease may have been directed more at EI rather than Strangles, possibly explaining the lower numbers of laboratory diagnosed S. equi samples seen this quarter.

In Q2 Leicestershire and Rutland saw the highest number of S. equi diagnoses followed by parts of West Sussex and Cheshire. The most frequently reported clinical signs were nasal discharge and pyrexia (a raised temperature ≥38.5°C) followed by ‘other’ clinical signs. ‘Other’ clinical signs included bastard strangles (S. equi abscesses in other sites of the body, including but not limited to, the sinus, lung and kidneys), purulent material seen in the guttural pouches via endoscopy and difficulty swallowing.


Download Q2 2019 graphic

June 2019 Outbreak Map

Strangles laboratory diagnoses from June 2019

May 2019 Outbreak Map

Strangles laboratory diagnoses from May 2019

Q1 2019 Summary (January – March)

Strangles laboratory diagnoses from Q1 2019

In the first three months of 2019 there were 118 laboratory confirmed diagnoses of Strangles across the UK, from samples submitted by 57 veterinary practices. Through the information gathered by SES it’s possible to broadly visualise where in the country these diagnoses of Strangles are happening, as shown in our map. Areas with higher numbers of diagnoses were identified, including Monmouthshire and Newport, Northumberland and parts of West Sussex and Cheshire. Through further information provided by vets when submitting samples, SES identified that, 38% of samples came from commercial premises, 32% from private and 29% from other premises types.

Diagnoses of Strangles were seen across all major breed types, with sports horses and UK native pony types accounting for nearly two thirds of diagnoses where breed was stated. These findings show that Strangles doesn’t discriminate as to which horses will become ill and that it can affect any horse doing any range of activities from frequent competitions or meeting another horse out on a hack.

Download Q1 2019 graphic

2018 Summary

Strangles laboratory diagnoses from 2018

We are very grateful to the following for their ongoing support of this work:

Supported by The Horse Trust

Supported by SEIB Insurance Brokers