TABLE II Vaccinations Guidelines for Mature Horses

TABLE II
Vaccinations for Broodmares

Disease	Administration	Comments
Botulism	Initially, at least three times during gestation, one month apart with the last injection 4 to 6 weeks before parturition. Annual vaccination 4 to 6 weeks before parturition.	Only in endemic areas. Local tissue reaction; anaphylaxis (shock) in some animals. Heat and minor swelling may occur at the injection site.
Equine viral arteritis	Open or maiden mares but at least 3 weeks before breeding.	Do not vaccinate pregnant mares See Table I
Influenza	Biannually Booster shot 4 to 6 weeks prior to birth of foal.	See Table I
Rabies	Annually, before the breeding season.	See table I
Rhinopneumonitis	Gravid mares at 5, 7, and 9 months of gestation. Open and maiden mares at same time as gravid mares.	If mares are beyond 5 months of pregnancy at first vaccination, continue with vaccination very two months until birth See Table I Deep intramuscular injection in hindleg Currently, only two vaccines are marketed to prevent abortion in mares
Tetanus toxoid	One month before parturition (birth).	See table I
West Nile Virus	One month prior to breeding.	See Table 1 Has been used in pregnant mares in high risk areas but not approved for this.