For vaccination of healthy horses 6 months of age or older, as an aid in the prevention of abortion and respiratory disease associated with Equine Herpesvirus 1 infection. For pregnant mares give a 2 mL dose IM during the 5th, 7th and 9th months of pregnancy. Three doses are essential for primary immunization. For primary immunization against respiratory disease administer three 2 mL doses IM at 4 to 6 week intervals. A 2 mL dose should be administered annually or at times of very probable exposure. Do not vaccinate within 21 days before slaughter.