C. Reproductive Damage: The Silent Threat to Breeding Farms

For pregnant mares, EHV brings a different set of dangers.
The virus can cross the placental barrier, leading to:

• Abrupt abortion (often without warning)
• Premature or weak foals
• Potential outbreaks within the broodmare band

A single EHV abortion often triggers a full-farm lockdown, meaning halted breeding operations, isolation zones, and strict biosecurity for weeks.

For farms operating on seasonal timelines, these losses are not just emotional—they can reshape an entire year’s breeding program.

Long-Term Impacts on Horses: Recovery Isn’t Always Linear

EHV is a herpesvirus, which means once a horse is infected, the virus can lie dormant for life. Stress, travel, and illness can reactivate it—similar to cold sores in humans.

Some horses experience:

• Persistent weakness or coordination issues after EHM
• Long-term respiratory sensitivity
• Reduced athletic performance
• Higher vulnerability to future infections

While many horses recover well, others never return to their previous form, especially in high-intensity disciplines like barrel racing, eventing, or racing.