(Merck) EquiNile West Nile Virus Vaccine is for the vaccination of healthy horses as an aid in reduction of disease, encephalitis, and viremia caused by West Nile Virus. EquiNile WNV is adjuvanted with Havlogen. Give 1 ml IM to horses 6 months of age and older, repeat with a single dose in 3 - 4 weeks. Annual revaccination with a single dose is recommended. Killed vaccine.