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Equine disease outbreak - what to do?

If there’s an equine disease outbreak on your yard, there are steps you can take to manage the outbreak and help prevent it from spreading within and from your yard

  • Last reviewed: 21st October 2024
Large Isolation 2 Large Isolation 2

What to do when you first suspect a horse is infected

If you’re concerned that a horse has been exposed to a contagious disease, has a high temperature or is showing signs of illness, you should immediately: 

  • Isolate them, contact your vet and notify your yard manager 
  • Set up a designated, isolated area to warn people not to go near or touch the horse 
  • Closely monitor the horse including:  
    • How much they’re eating and drinking
    • Their temperature
    • Number and consistency of droppings and able to pass urine as normal
    • Signs of coughing and nasal discharge
    • Are they lethargic or irritable?

      Horses temperature being taken

Speak out!

Speaking out is a vital part of a proactive response to help prevent further disease spread and promote good practices on the yard. If you’ve any reason to suspect a horse may have or has been confirmed with a contagious disease, act immediately and warn other yards in your area along with any visitors to your yard, for example a farrier. We should commend and support those yards who take this action. 

What to do once there's a confirmed case

Ideally your yard will have a biosecurity plan in place both for day-to-day and in the event of disease outbreak. Make sure that all attendees to the yard follow these procedures. In the event of a disease outbreak, discuss the plan with your vet, or if there isn’t one already prepared, your vet will be able to advise.

Using a traffic light system is a way to separate horses into colour-coded groups based on the likelihood they’ve been exposed to the disease. This helps to minimise the spread of disease and also helps you to make sure individual horses are monitored appropriately.

Horse Health Status

Horse Health Status


(hover over each section to see the colour-coded groups)

Group Description Details
Red Horse showing any concerns of disease and confirmed cases.
  • Immediately isolate from all other horses, ideally, to a different location on the property well away from the healthy horses
  • Seek veterinary attention and support
Amber All horses who have been in any contact with those in the RED group in the last 3 weeks but are not showing clinical signs.
  • Keep separate from those in the red and green groups
  • Closely monitor for the development of any clinical signs of disease
  • Take their temperature twice daily. An increased temperature often appears before other clinical signs of disease.
  • If you have concerns for a horse, contact the vet immediately as they may have to move into the RED group
Green All horses who have no contact with either RED or AMBER group horses in the last 3 weeks and showing no clinical signs of disease.
  • Keep separate from those in the red and amber groups
  • Closely monitor for the development of any clinical signs of disease
  • Take their temperature twice daily
  • If you have concerns for a horse, contact the vet immediately as they may have to move into the RED group

More steps to take

  • Colour coordinate all equipment, so everything is kept within the relevant colour zone. 
  • Disinfect all equipment after use.
  • Try to avoid changing who cares for the horses in each group. However, if staffing is limited, handle the horses in the order of green, amber, red, and between each group, change coveralls, disinfect boots and wash your hands. 
  • Keep records and monitor all horses closely. 
  • Do not move horses from the yard regardless of what colour group they are in, as they may be infected but not yet showing any signs. 
  • Work closely with your vet, and do not move any horses out of their isolation group until your vet confirms they are completely disease-free.  
  • If you have horses under different vets on the yard, make sure the vets are all informed so they can work closely together. In such cases, a lead vet is often nominated to communicate between all involved and avoid multiple vets entering the yard. 

Get in touch – we’re here to help 

The Horse Care and Welfare Team are here to help and can offer you further advice with any questions you may have. Contact us on 02476 840517* or email welfare@bhs.org.uk – You can also get in touch with us via our social media channels. 

Opening times are 8:35am - 5pm from Monday – Thursday and 8:35am - 3pm on Friday. 

*Calls may be recorded for monitoring purposes.