EHV-1 in Horses: What Every Owner Needs to Know (and How to Support Your Horse’s Immune System Naturally)

By Iron Will Performance

EHV-1 isn’t a new virus — but recent outbreaks have reminded horse owners just how fast it can spread, how severe it can become, and how critical immune strength is during high-stress seasons like fall futurities, sales, and weather changes.

In this guide, we break down what EHV-1 really is, how it spreads, the early warning signs, and how to support your horse’s immune resilience with targeted nutrition.

What Is EHV-1 and Why It Matters

EHV-1 is a contagious virus that primarily affects horses. It belongs to the herpesvirus family, which means it can remain dormant in horses and reactivate under stress or immune challenges. The virus spreads through direct contact with infected horses, contaminated equipment, or airborne droplets from coughing.

The virus causes several forms of disease:

1. Respiratory Form

• Fever

• Nasal discharge

• Cough

• Lethargy

2. Neurologic Form (EHM – Equine Herpes Myeloencephalopathy)

• Ataxia (uncoordinated movement)

• Hind-end weakness

• Difficulty standing

• Inability to urinate

• Can be fatal

3. Reproductive Form

• Pregnancy loss

• Weak or nonviable foals

Because of its contagious nature and potential severity, EHV-1 outbreaks can disrupt training, competitions, and breeding programs. Early detection and supportive care are essential to reduce spread and improve outcomes.

How EHV-1 Spreads and Signs to Watch For

EHV-1 spreads quickly in environments where horses are in close contact, such as stables, shows, or horse trailers. The virus can survive on surfaces for several days, making hygiene critical.

This time of year creates the perfect storm for viral spread:

• Frequent hauling and travel

• Futurities, jackpots, and major sales

• Weather changes and temperature drops

• Increased stalling, shared barns, and communal areas

• Immune suppression from stress and environment changes

Stress and immune weakness dramatically increase susceptibility to viral infections — including EHV-1.

Common signs of EHV-1 infection include:

• Fever above 101.5°F (38.6°C)

• Nasal discharge and coughing

• Swollen lymph nodes

• Loss of appetite and lethargy

• Neurological signs like stumbling, weakness, or inability to stand (in severe cases)

  
  

If you notice these symptoms, isolate the horse immediately and contact a veterinarian. Early diagnosis can help manage the disease and prevent further spread.

Supporting Equine Health During EHV-1 Outbreaks

While there is no cure for EHV-1, supportive care can help horses recover and reduce complications. This includes:

• Providing a clean, stress-free environment

• Ensuring proper hydration and nutrition

• Monitoring temperature and neurological signs closely

• Administering veterinary-prescribed medications when necessary

  
  

Nutrition plays a key role in supporting the immune system during viral infections. This is where supplements like 6 PAC Equine come into play.

How Ingredients in 6 PAC Equine Support Horses Facing EHV-1

6 PAC Equine is formulated with ingredients that support immune function, reduce inflammation, and promote overall health. Here are some key components and how they help:

Concentrated Aloe Vera (Gut & Immune Support)

The Aloe Vera in 6 PAC Equine contains a highly concentrated and potent immune-modulating polysaccharide that supports:

• Stronger mucosal immunity

• Reduced gut inflammation

• Better barrier protection against viral stress

Since over 70% of immune function takes place in the gut, supporting gut lining integrity is essential during outbreaks.

Pre + Probiotics (Microbiome Stability)

Stress disrupts the microbiome, leading to a weakened immune response. Probiotics in 6 PAC Equine help:

• Support antibody response

• Maintain stable gut flora during hauling and stress

• Increase resistance to harmful pathogens

A balanced microbiome = a stronger immune foundation.

Natural Vitamin E (Neurological & Immune Support)

Vitamin E plays a major role in:

• Reducing oxidative stress

• Supporting nerve tissue

• Maintaining immune cell function

Many performance horses are deficient, making supplementation especially important during outbreak seasons.

EPA/DHA Omega-3s (Inflammation Regulation)

Omega-3 fatty acids help modulate inflammation, supporting:

• Respiratory health

• Cardiovascular function

• Joint health

• Immune balance

Inflammation is a major factor in how the body responds to viral stress.

Chromium (Stress & Cortisol Response)

High cortisol suppresses the immune system. Chromium helps:

• Support a healthier stress response

• Improve glucose utilization

• Support metabolic balance during training and travel

Lower cortisol = stronger defense.

Vitamin C

Vitamin C is a powerful antioxidant that supports the immune system by protecting cells from oxidative stress caused by infection. Horses produce vitamin C naturally, but during illness, their needs increase. Supplementing vitamin C can help maintain immune defenses.

Zinc

Zinc is essential for immune cell function and wound healing. It helps regulate the immune response and supports recovery from infections. Zinc deficiency can impair the horse’s ability to fight viruses like EHV-1.

Selenium

Selenium works with vitamin E as an antioxidant, protecting cells from damage. It also supports immune health and reduces inflammation. Balanced selenium levels are important for horses under stress or illness.

Omega-3 Fatty Acids

Omega-3s have anti-inflammatory properties that can help reduce tissue damage caused by viral infections. They support brain and nerve health, which is particularly important if neurological symptoms develop.

Why Nutrition Matters During EHV-1 Outbreaks

Biosecurity, vaccinations, and vet care are your first lines of defense — but strengthening the internal immune system is equally important.

6 PAC Equine supports:

• Immune resilience

• Microbiome stability

• Gut integrity

• Inflammation balance

• Vitamin E levels

• Stress regulation

• Muscle recovery and hydration

• Overall metabolic health

All of which are essential during times of viral exposure.

• Start early: Begin supplementation at the first sign of stress or illness to support immune function.

• Follow dosage instructions: Use the recommended amounts to ensure safety and effectiveness.

• Combine with good management: Maintain clean stalls, reduce stress, and isolate sick horses.

• Consult your vet: Supplements support but do not replace veterinary care.

  
  

Preventing EHV-1 Spread and Protecting Your Horses

Prevention is the best defense against EHV-1. Here are practical steps:

• Quarantine new arrivals for at least 21 days.

• Avoid sharing equipment between horses.

• Clean and disinfect stalls, trailers, and tack regularly.

• Limit horse-to-horse contact during outbreaks.

• Monitor horses daily for signs of illness.

• Vaccinate according to your veterinarian’s advice.

  
  

Supporting your horse’s immune system with proper nutrition and supplements like 6 PAC Equine can make a difference in how they handle viral infections like EHV-1. While no supplement can prevent infection entirely, providing the right nutrients helps horses stay strong and recover faster.

Taking proactive steps to maintain health and hygiene protects your horses and the larger equine community. Stay informed, stay prepared, and prioritize your horse’s well-being.

If you suspect EHV-1 in your stable, contact your veterinarian immediately for testing and guidance. Use supplements thoughtfully as part of a comprehensive care plan.

Your horse’s health depends on your vigilance and care. Supporting their immune system with balanced nutrition is one of the best ways to help them face challenges like EHV-1.

Learn more about the science-backed ingredients inside 6 PAC Equine by clicking on the logo below:

Enter code EHV1 to receive 10% off your order.