) Recommended for the vaccination of healthy, susceptible swine as an aid in the reduction of disease associated with PRRS virus, reproductive and respiratory forms. For use in pigs, gilts and sows (including pregnancy) at any stage of production in PRRS-virus positive herds. Sows and Gilts: Inject a single 2 ml dose IM 3-4 weeks prior to breeding; booster prior to each subsequent breeding or at any stage of pregnancy. Piglets: Inject a single 2 ml dose IM in swine 3 weeks of age or older for the respiratory form of PRRS. Requires mixing.