UNAIR Inactivated COVID-19 Vaccine as Heterologue Booster (Immunobridging Study)

This is an observer blind randomized controlled trial. There will be 2 groups in the study. First group will receive CoronaVac vaccine, manwhile the other group will receive Vaksin Merah Putih - UA SARS-CoV-2 (Vero Cell Inactivated) vaccine. The inclusion and exclusion criteria for the subjects were listed below. All subjects will receive either one dose of CoronaVac or Vaksin Merah Putih - UA SARS-CoV-2 (Vero Cell Inactivated) vaccine and be followed for 6 months. The vaccine will be administered intramuscularly. This study will have one interim and one full analysis reports. The main focus is immunogenicity and safety issues. Data Safety Monitoring Board will be commissioned for this study to evaluate safety data over the study period and to review any events that meet a specific study pausing rule or any other safety issue that may arise. They will review the blinded 7 and 28 days safety data following the vaccine, and then the 3 and 6 months safety data. The immunogenicity data will be evaluated until 6 months.