Equine Herpes Explained: Signs, Causes and Prevention

Owning a horse involves caring deeply for its health, including understanding diseases like equine herpes that may affect them over time. This guide explains the important aspects of equine herpesvirus infection, helping horse owners spot symptoms, understand causes, and take proper precautions to keep their horses safe and healthy.

Understanding Equine Herpes and Its Strains

Equine herpes refers to infections caused by equine herpesviruses, chiefly involving two important strains: Equine Herpesvirus 1 (EHV-1) and Equine Herpesvirus 4 (EHV-4). Both affect horses differently but involve respiratory illness and reproductive issues.

EHV-1 is notorious for causing respiratory problems but also can lead to pregnant mares aborting their foals, stillbirths, or neonatal death. A severe but rare manifestation is neurological disease, called equine herpes myeloencephalopathy (EHM), causing paralysis and sometimes death. Conversely, EHV-4 tends to cause mostly respiratory disease, especially in young horses, with occasional abortion risks that are less frequent than with EHV-1.

The viruses spread primarily through direct contact with nasal secretions or aborted materials and can be transmitted even by horses simply nosing each other. They may also spread indirectly via contaminated equipment and aerosolised droplets.

Importantly, horses can carry the virus latently without visible symptoms—stressors like transport or other illness can reactivate the virus, potentially causing outbreaks. Understanding this latent nature helps explain why rigorous biosecurity and monitoring are critical on yards.

Recognising the Signs of Equine Herpes

If you suspect your horse has been exposed to EHV, be vigilant for these symptoms:

• Elevated temperature (fever)
• Coughing and nasal discharge
• Loss of appetite, even for favourite treats
• General depression or lethargy

In neurological cases (rare), signs might include stumbling, weakness in limbs, loss of coordination, or paralysis. Pregnant mares may suffer aborted foals without earlier obvious symptoms.

Is Equine Herpes a Serious Concern?

Equine herpesvirus is a significant health concern due to its contagious nature and potential severe outcomes. However, early recognition, isolation, and veterinary involvement can prevent widespread infection.

If your horse shows symptoms or you suspect contact with an infected animal, isolate it immediately to prevent direct or indirect spread. Implement strict hand hygiene when handling your horse, and disinfect any trailers, tack, or shared equipment with vet-advised disinfectants to reduce contamination risks.

Any other horses on the premises that might have had contact should be observed closely and remain onsite until a vet confirms the health status of all horses. Your veterinary professional will take appropriate diagnostic tests and recommend treatments or quarantine as necessary.

Vaccination: What Every Horse Owner Should Know

Vaccines are available that target both EHV-1 and EHV-4, often combined with equine influenza vaccination. These vaccines help reduce respiratory symptoms but are less effective against the neurological effects of EHV-1.

Veterinary guidance recommends vaccinating healthy horses as part of a routine programme started when they are young. If an outbreak is occurring, vaccinating potentially incubating horses may increase risk of worsened symptoms, so vaccination should be deferred until vet clearance.

Always have your vet examine any horse with respiratory signs before vaccination to ensure they are fit and not incubating disease. Horses previously infected and fully recovered can be safely vaccinated to help prevent future infections, though the vaccine's impact may be less potent in carrier horses.

Biosecurity and Introducing New Horses

Good husbandry practices reduce equine herpes risk. New arrivals to a yard should always be quarantined away from other horses in separate stabling and turnout paddocks to prevent potential disease transmission.

Maintain stable hygiene, clean water buckets and feed bowls regularly, and assign individual equipment for each horse. These measures prevent cross-contamination among horses and help uphold a healthy environment.

Conclusion

Equine herpes is a complex viral infection demanding careful attention by horse owners. By recognising early signs, applying prevention measures including quarantine of new horses, and following veterinary advice on vaccination and biosecurity, you can protect your horses from this contagious disease.

If you ever suspect equine herpes infection, consult your vet swiftly while isolating affected horses to avoid spreading the virus across your yard. Responsible care and vigilance will help your horses thrive safely throughout the year.

For those seeking to find a horse, always choose reputable sources ensuring animals are healthy, vaccinated, and well cared for. For more information on horses for sale, please visit trusted listings to support responsible ownership.