Based on pre-clinical trial and phase 1 clinical data and principle of GCP, the objective of phase Ⅱ clinical trial is to evaluate safety and immunogenicity of Inactivated Poliomyelitis Vaccine made from Sabin Strains(Sabin IPV).

The Sabin IPV was manufactured with poliovirus type1, 2, 3 Sabin strains and Vero cells by microcarrier culture in 550 liter bioreactors. The virus suspension was harvested ,ultra-concentrated, purified and inactivated with formalin. Three formulations A,B,C of Sabin IPV were used, the DAg contents for A were type1 45,type2 64,type3 67.5 DU /0.5ml/per dose; for B 30,32,45 DU/0.5ml/per dose; for C 15,16,22.5 DU/0.5ml/per dose.

Oral Poliomyelitis Vaccine(OPV)was manufactured by Institute of Medical Biology, Chinese Academy of Medical Sciences.Trivalent OPV contains Polioviruses Type 1 6.0 log CCID Type 2 5.0 log Type 3 5.5log /0.1ml/per dose Inactivated Poliomyelitis Vaccine (Salk strains)was manufactured by Sanofi Pasteur DAg contents /0.5ml/per dose were Type 1 40 DU,Type 2 8DU,Type 3 32DU.

This is a randomized, blind phase 2 clinical trial. Total 500 infants (ages 60 days to 90 days) were selected , randomized to five groups(each group n=100) Sabin IPV formulations A,B,C,OPV ,Salk IPV were separately given to each group with three doses one month apart respectively.

Inclusion Criteria:

• Males and females, age from 60 days to 90 days;
• Adults, parent(s) or guardians are able to understand and sign informed consent for participation;
• Participants or guardians are able to attend all planned clinical appointment and obey and follow all study instructions;
• Infants no vaccinated with poliovaccine or other preventive biologicals in recent 7 days;
• Axillary temperature ≤37℃.

Exclusion Criteria:

• Have medical record of participants or their family on allergy, convulsion, falling sickness, encephalopathy and psychopathy;
• Low platelet or bleeding disorder do not allow vaccination into the muscle;
• Have damaged or lower immunological function;
• Received blood, plasma or immunoglobulin treatment since birth;
• Have inborn abnormality, develop obstacles or clinical diagnostic serious chronic ( Down Syndrome, diabetes, sickle cell anemia or neural Guillain-Barre Syndrome );
• Have or be doubtful of following diseases: respiratory system diseases, acute infection or active chronic, cardiovascular diseases, liver and kidney diseases, skin diseases, HIV.

Exclusion Criteria for doses 2 and 3

• Have serious anaphylaxis or high fever, convulsion during first dose;
• Have any circus of Exclusion Criteria after Eligible for study;
• Have serious adverse event which related to previous vaccination; Withdrawal and Discontinuance Criteria;
• Received necessary or interference study drugs such as: immune-inhibition or immune-stimulating agents;
• Vaccinated with any other vaccine（except DTP）;
• Stop observation determined by investigator owing to occurring serious adverse event;