Merck Animal Health Prestige 4 Vaccine, 1 mL

This product has been shown to be effective for the vaccination of healthy horses six months of age or older against Eastern and Western encephalomyelitis viruses, EIV and tetanus. Duration of immunity has been shown at six months for EIV. Duration of immunity has not been established for Eastern and Western Encephalomyelitis and Tetanus. For more information regarding safety and efficacy data, go to productdata.aphis.usda.gov. This product has been shown to be effective against virus shedding of EIV.