Prestige® WNV

This product has been shown to be effective for the vaccination of healthy horses 6 months of age or older against West Nile Virus. Duration of immunity has not been established. For more information regarding safety and efficacy data, go to This product has been shown to be effective against encephalitis and viremia caused by West Nile Virus.

The Science of Advanced

  • WNV is considered a core vaccination recommended by the AAEP vaccine guidelines and is indicated in the immunization program for all horses each year.
  • Exceptional safety profile with the smooth Havlogen® adjuvant
  • Advanced filtration process through the Antigen Purification System (APS)


Gold Standard Challenge Study

In the immunogenicity intrathecal challenge study, the West Nile virus fraction of the Prestige 5 + WNV, Prestige 3 + WNV and Prestige WNV vaccines demonstrated a statistically significant reduction for the following parameters in vaccinates as compared to controls1:

1. Data on file, Merck Animal Health.




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.