This product has been shown effective for the vaccination of healthy horses 6 months of age or older against Eastern and Western encephalomyelitis (EEE and WEE) viruses, equine influenza virus (EIV), equine herpesvirus type 1 (EHV-1), equine herpesvirus type 4 (EHV-4), and tetanus. Duration of immunity has been shown at 6 months for EIV. This product has been shown to decrease virus shedding of EIV and EHV-1. Foals nursing immune dams should be vaccinated when maternal antibody levels will allow active immunization.