Equine Infectious Diseases

Many of us have experienced the anxiety that comes with knowing an infectious equine disease has been detected nearby – especially if that outbreak occurs at a competition, where illness can spread quickly. Disease outbreaks can create missed competitive opportunities and, more importantly, threats to horse health and welfare.

Practicing good biosecurity is your first line of defense in the face of an outbreak, but before one occurs, you need to have a working knowledge of common infectious disease agents, clinical signs of infection, treatment options, and preventative measures to keep horses healthy.

Equine infectious disease pathogens can be grouped based on the body systems they impact most:

  1. Respiratory Equine Herpesvirus, Equine Influenza, Equine Strangles, Equine Viral Arteritis
  2. Gastrointestinal Salmonella, Coronavirus, Parasitic infections (External Parasites, Internal Parasite Control)
  3. Neurologic Equine Herpesvirus Myeloencephalopathy, Arboviruses (Eastern/Western/Venezuelan Encephalitis), West Nile Virus
  4. SkinVesicular Stomatitis

Click the links above to learn more about each disease.

General Best Practices for Preventing Infectious Diseases

  1. Basic Biosecurity
    1. Check your horse’s temperature twice daily
    2. Observe for clinical signs of illness (cough, nasal discharge, fever, abnormal feces, change in water consumption, change in fecal output or fecal consistency, abnormal gait or mentation)
    3. Consult a veterinarian for vaccination and parasitic control program
    4. Isolate any horse with clinical signs of disease or a fever (temperature over 101.5ºF)
    5. Veterinary examination and diagnostic testing of horses with clinical signs compatible with infectious disease
    6. Routine cleaning and disinfecting of stables and equipment
    7. Avoid sharing of equipment that has not been cleaned and disinfected between uses.
  2. If you suspect you’re dealing with an infectious disease, contact your veterinarian and follow these steps.

Forms and Publications

AAEP Signs of Respiratory Inflammation in Horses Graphic

Labored breathing, fever, cough and other symptoms may indicate respiratory inflammation.

Equine Disease Communication Center

The Equine Disease Communication Center (EDCC) is an industry-driven initiative which works to protect horses and the horse industry from the threat of infectious diseases in North America. The communication system is designed to seek and report real time information about diseases similar to how the Centers for Disease Control and Prevention (CDC) alerts the human population about diseases in people.

Temperature Log

This Temperature Log allows you to quickly record temperatures that are taken for your horse.

Vaccination Guidelines - AAEP

Vaccination Record Template

This template allows the following vaccine information to be recorded: horse and owner name, date, place and country, name/batch/route mode of vaccine, and name/signature/stamp of veterinarian.

USEF Health Declaration Form

This form allows competitors and trainers to declare their horse free of diseases like EHV-1 as is used in this example.