Prestige 4, formally known as Encevac TC-4, is for vaccination of healthy horses 6 months of age or older, as an aid in the prevention of disease caused by Eastern and Western encephalomyelitis viruses and tetanus and as an aid in the control of respiratory disease and as an aid in the reduction of virus shedding caused by EIV. Duration of immunity (DOI) has been shown to be at least six months for EIV.
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