11/20/2025
If you are traveling to competitions, board with horses who do travel, or have pregnant mares, regular boosters (every 3-4 months) for Rhinopneumonitis (EHV-1/EHV-4) are recommended. Some important facts about the vaccine that you should know:
•It reduces nasal shedding of EHV-1/EHV-4.
• It reduces severity and duration of respiratory disease.
• It reduces abortion storms with the EHV-1 abortion strains.
• But it does not prevent the neuropathogenic mutation (D752) from causing vascular endothelial damage → spinal cord and brain vasculitis.
• Only ~10% of EHV-1 isolates carry the neuropathogenic mutation (D752).
Range across studies: 3–19%, but ~10% is the accepted average.
• The non-neuropathogenic N752 strain accounts for ~90% of isolates.
Remember, vaccines are only one tool in preventing disease. Make sure your horses are healthy before travel, limit horse to horse contact at an event, don’t share tack or equipment, and disinfect your equipment.
If possible, quarantine horses after travel, especially from pregnant mares.
As always, we are here to answer any of your questions and we have vaccine in stock if you are in need of a booster before traveling.