Poliomyelitis Vaccine (Vero Cell), Inactivated, Sabin Strains (sIPV) is independently developed by BIBP and has independent intellectual property rights. This product is a trivalent liquid vaccine prepared by inoculating Vero cells with Type I, II and III attenuated Sabin strains respectively, cultivating and harvesting virus solution, concentrating, purifying, inactivating, and then mixing in proportion.