Poliomyelitis Vaccine (Vero Cell),Inactivated,Sabin Strains(Beijing Institute of Biological Products)

The primary study objective was to evaluate the positive rate, positive conversion rate and antibody level of type I, II and III neutralizing antibodies of Sabin strain inactivated poliomyelitis vaccine (Vero cells) in infants and young children aged 2 months and above after sequential primary immunization. The secondary study objective was to evaluate the safety of different sequential primary immunization schedules and the immunogenicity and safety before and after booster immunization in infants and young children aged 18 months and above in different sequential immunization schedule groups.

To evaluate the safety and immunogenicity of inactivated polio vaccine (Sabin strain) for primary immunization in 2-month-old infants and to evaluate the safety and immunogenicity of inactivated polio vaccine (Sabin strain) for booster immunization in 18-month-old children.