A booster dose can be administered at more frequent intervals based upon individual horse or farm disease risk assessment or any time epidemic conditions exist or are reported. Duration of immunity is under development. Foals nursing immune-dams should be vaccinated when maternal antibody levels will allow active immunization. EquiNile West Nile Vaccine contains inactivated, concentrated, adjuvanted, tissue culture origin West Nile Virus - Flavivirus Chimera.
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