Lot-consistency Clinical Trial of Sabin Strain Inactivated Polio Vaccine

Inclusion Criteria: * Healthy infants aged 60-89 days; * legal identity; * Informed consent form has been signed by guardians. Exclusion Criteria: * Vaccination history of polio vaccine; * Allergy history, history of asthma, including allergy history to vaccine or vaccine components, serious adverse reactions to the vaccine, such as urticaria, dyspnea, angioneurotic edema or stomachache, etc.; * Congenital malformation or developmental disorder, genetic defect, serious malnutrition, etc.; * Autoimmune disease or immunodeficiency/immunosuppression; * Serious nervous system disorders (epilepsy, convulsion or tic) or mental disorders; * Abnormal coagulation functions (such as coagulation factor deficiency, blood coagulation disease and blood platelet disorders) or obvious bruise or blood coagulation disorders diagnosed by the doctors; * Receipt of immunosuppressant therapy, cytotoxic drug therapy and inhaled corticosteroid therapy (excluding the corticosteroid aerosol therapy for allergic rhinitis and surface corticosteroid therapy for acute non-complicated dermatitis); * Receipt of blood products prior to this study; * Receipt of other study drugs within 30 days prior to this study; * Receipt of live attenuated vaccines within 14 days prior to this study; * Receipt of subunit or inactivated vaccines within 7 days prior to this study; * Acute diseases or acute exacerbation of chronic diseases within recent 7 days; * Axillary temperature \>37.0℃; * Any other factors which are unsuitable for participation in the clinical trial as judged by the investigator.