Pfizer - For vaccination of healthy swine 3 weeks of age or older as an aid in preventing respiratory disease caused by swine influenza virus (SIV) subtypes H1N1 and H3N2 and Mycoplasma hyo-pneumoniae. Two 2 ml doses approx. 3 weeks apart. In young pigs, vaccinate after maternally derived antibodies to swine flu have declined. Semiannual revaccination with a single dose is recommended. 21 day withdrawal.