A Phase 3 Study to Evaluate the Immunogenicity and Safety of Minhai's PCV13-DT/TT Vaccine As Compared to Pfizer's PCV13 Vaccine

A total of approximately 500 infants 6-8 weeks of age (WOA) will be enrolled and randomized in 1:1 ratio into the study group and control group, with 250 participants in each group.The study group will receive study PCV13 vaccine and control group will receive Prevenar13® vaccine at 2, 4 and 12-15 months of age (MOA, as early as 6 weeks of age as per WHO recommendations for administration of PCV to infants). Hexavalent vaccine will be injected at 2, 3 and 4 months of age.

Inclusion criteria

• Healthy infants based on medical history and clinical assessment.
• Infants age of 6-8 weeks at enrolment. Infants will be eligible since the day they reach 6 weeks of age and until 8 weeks of age included.
• *Body weight at enrollment ≥3.0 kg (If the subject does not meet the criteria, the visit may be rescheduled when the criteria is met.).
• *On the day of vaccination and within 3 days prior to 1st dose of vaccination, axillary temperatures <37.5°C/99.1°F (If the subject does not meet the criteria, the visit may be rescheduled when the criteria is met.).
• Infant's parent(s) or legal guardian must be able and willing to provide voluntary written/thumb-printed informed consent for the infant to participate in the study.
• Infant's parent(s) or legal guardian must be willing and able to comply with all scheduled visits, vaccination plan, laboratory tests, lifestyle considerations, and other study procedures.
• The infant's mother must provide related medical certificate(s) for the negative results for HIV, HBV and syphilis infection within 1 year prior to screening.
• Infant's parent(s) or legal guardian must have a readily identifiable place of residence in the study area, be available for the duration of trial participation, and have a means of telephone contact.

Note: For items with an asterisk (*), If the subject does not meet the criteria, the visit may be rescheduled when the criteria is met.

Exclusion criteria

• Use of any investigational product other than that used in the study prior to randomization or planned use of such a product during the period of study participation.
• History of S. pneumoniae infection as confirmed by laboratory testing if available.
• The infant who are children in care, preterm and low-birth-weight (Preterm infants have a gestational age below 37 weeks at birth and low-birth-weight infants have a birth weight below 2.5 kg).
• History of allergic disease or history of a serious reaction to any prior vaccination or known hypersensitivity to any component of the investigational vaccine. And/or all components of the hexavalent vaccine.
• History of anaphylactic shock.
• Any abnormal vital sign as judged by the investigator.
• *Participant experiences acute diseases or acute exacerbation of chronic diseases or uses antipyretic, analgesic and anti-allergic drugs (such as paracetamol, ibuprofen, aspirin, loratadine, cetirizine, etc.) within 3 days before vaccination.
• *History of administration of attenuated vaccines within 14 days (<14 days) and inactivated vaccines within 7 days (<7 days) prior to the 1st dose of investigational vaccine (If the participant[s] does not meet the criteria, the visit may be rescheduled when the criteria are met).
• Previous vaccination against diphtheria, tetanus, pertussis, polio, hepatitis B, Haemophilus influenzae type b, Neisseria meningitidis and/or Streptococcus pneumoniae with the exception of vaccines where the first dose can be given before 2 months of life according to the national recommendations.
• History of or intercurrent diphtheria, tetanus, pertussis, hepatitis B, polio, Haemophilus influenzae type b disease, Neisseria meningitidis.
• Individuals who receive treatment with radiotherapy or immunosuppressive therapy, including cytotoxic agents or systemic corticosteroids (if systemic corticosteroids are administered for ≥14 days at a dose of ≥10 mg/day of prednisone or equivalent), e.g., for cancer or an autoimmune disease, or planned receipt throughout the study. Inhaled/nebulized, intra-articular, epidural, or topical (skin or eyes) corticosteroids within indicated dosage are permitted.
• *Administration of immunoglobulins and/or any blood products or anticipation of such administration within 28 days before vaccination and during the study period.
• History of known disturbance of coagulation or blood disorder that could cause anemia or excess bleeding (e.g., thalassemia, coagulation factors deficiency, severe anemia at birth).
• History of suspected primary immunodeficiency.
• History of meningitis, seizures or any neurological disorder.
• A family history of congenital or hereditary immunodeficiency.
• The infant is a direct descendant (child or grandchild) of any person employed by the Sponsor, the CRO, the investigator, study site personnel.
• Any medical or social condition that in the opinion of the investigator may compromise the well-being of the study participant, interfere with the study objectives, pose a risk to the study participant, or prevent the study participant from completing the study follow-up.

Note: For items with an asterisk (*), if the participant meets these exclusion criteria, the visit may be rescheduled for a time when these criteria are not met.