For vaccination of healthy horses 6 months of age or older as an aid in reduction of disease, encephalitis, and viremia caused by West Nile Virus. Foals nursing immunedams should be vaccinated when maternal antibody levels will allow active immunization.
For primary vaccination aseptically administer 1 mL intramuscularly, repeat with a single dose in 3 – 4 weeks. Historically, annual revaccination with this product has been recommended. The need for this booster has not been established. The presence of maternal antibody is known to interfere with the development of active immunity in foals and additional boosters will be required in most young animals. For more information on revaccination frequency, consult your veterinarian.