(Boehringer Ingelheim) Attenuated live virus for use in healthy horses as an aid in the prevention of infections of rhinopneumonitis. Vaccinate healthy horses 3 months of age or older with two doses, 3-4 weeks apart. Revaccination every 3 months with a single dose is recommended. Pregnant mare should be vaccinated after the second month of pregnancy. Requires mixing; cannot be stored after mixing.