Table: Sample Vaccination ScheduleforBroodmares*

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Sample Vaccination ScheduleforBroodmares*

Vaccine	Timing
Core vaccines recommended for all horses
Tetanus	4 to 6 weeks before foaling
West Nile virus	4 to 6 weeks before foaling
Eastern and Western equine encephalomyelitis	4 to 6 weeks before foaling
Rabies	4 to 6 weeks before foaling
Optional vaccines, depending on local risk
Equine influenza	4 to 6 weeks before foaling
Equine herpesvirus (EHV, rhinopneumonitis)	5, 7, and 9 months of pregnancy using an inactivated EHV-1 vaccine licensed for prevention of abortion; some veterinarians recommend also vaccinating at 3 months of pregnancy
Botulism	4 to 6 weeks before foaling in geographic regions where botulism causes disease
Equine viral arteritis (EVA)	Serology to check for antiviral antibodies should be done before vaccination; pregnant mares should not be vaccinated; if serology is negative, mares should be vaccinated before breeding to a positive stallion that is shedding the virus; mares must be isolated from other horses for 3 weeks after initial vaccination; positive titers may cause problems if the mare is to be shipped internationally
Rotaviral diarrhea	8, 9, 10 months of pregnancy; for all mares, regardless of vaccination history, in high-volume breeding programs
Potomac horse fever (equine monocytic ehrlichiosis)	4 to 6 weeks before foaling
*Recommendations are for previously vaccinated mares. A different schedule is required if a mare is unvaccinated or vaccination history is unknown.

Merck Manual