Usage and dosage:Recommended immunization program (intramuscular injection): 1 dose for piglets, nasal spray for 0-2 days of age, secondary immunization for 42-70 days of age, and tertiary immunization after one month; One reserve sow, immunized twice before mating (with an interval of one month); 1 sow per litter, every 4 months; Plant one boar every four months. Specification packaging:10 bottles/box