inclusion criteria: 1. children aged 6-12 years and adolescents aged 13-17 years at the time of randomization. 2. have received a complete two dose schedule of coronavac for ≥ 90 days. 3. obtain written informed assent from participants and consent from parents, guardians or legal representatives. 4. subjects are eligible for immunization of this product as evaluated by investigators after medical history examination, physical examination and clinical judgment of health.

inclusion criteria: 1. children aged 6-12 years and adolescents aged 13-17 years at the time of randomization. 2. have received a complete two dose schedule of coronavac for ≥ 90 days. 3. obtain written informed assent from participants and consent from parents, guardians or legal representatives. 4. subjects are eligible for immunization of this product as evaluated by investigators after medical history examination, physical examination and clinical judgment of health.

inclusion criteria: children aged 6-12 years and adolescents aged 13-17 years at the time of randomization. have received a complete two dose schedule of coronavac for ≥ 90 days. obtain written informed assent from participants and consent from parents, guardians or legal representatives. subjects are eligible for immunization of this product as evaluated by investigators after medical history examination, physical examination and clinical judgment of health.

inclusion criteria: children aged 6-12 years and adolescents aged 13-17 years at the time of randomization. have received a complete two dose schedule of coronavac for ≥ 90 days. obtain written informed assent from participants and consent from parents, guardians or legal representatives. subjects are eligible for immunization of this product as evaluated by investigators after medical history examination, physical examination and clinical judgment of health.

inclusion criteria: children aged 6-12 years and adolescents aged 13-17 years at the time of randomization. obtain written informed assent from participants and consent from parents, guardians or legal representatives. subjects are eligible for immunization of this product as evaluated by investigators after medical history examination, physical examination and clinical judgment of health.

inclusion criteria: children aged 6-12 years and adolescents aged 13-17 years at the time of randomization. obtain written informed assent from participants and consent from parents, guardians or legal representatives. subjects are eligible for immunization of this product as evaluated by investigators after medical history examination, physical examination and clinical judgment of health.