Boehringer Ingelheim Vetera EWT + WNV (West Nile + 2-way Sleeping Sickness + Tet) Equine Vaccine is for the vaccination of healthy horses 4 months of age or older as an aid in the prevention of disease caused by Eastern and Western equine encephalomyelitis, tetanus, and viremia caused by West Nile virus. Give 1 ml IM of Vetera EWT + West Nile Virus vaccine; repeat in 3-4 weeks using a different injection site. Revaccinate annually and prior to anticipated exposure with a single 1 ml IM dose.