inclusion criteria: informed consent from the parents or a legally acceptable representative for an underage participant biological parents of students enrolled in the trial or unrelated healthy adults ability to adhere to the follow-up schedules willingness to report reactogenicity daily for 7 days post dose 1, 2 and 3 (and 4) proactively willingness to receive that vaccine available for that particular recruitment period (as student-parent pair, if applicable) good past health, including pre-existing clinically stable disease, such as paediatric or immune disorders prior covid-19 (for covid-19 survivor subgroup)

inclusion criteria: informed consent from the parents or a legally acceptable representative for an underage participant biological parents of students enrolled in the trial or unrelated healthy adults ability to adhere to the follow-up schedules willingness to report reactogenicity daily for 7 days post dose 1, 2 and 3 (and 4) proactively willingness to receive that vaccine available for that particular recruitment period (as student-parent pair, if applicable) good past health, including pre-existing clinically stable disease, such as paediatric or immune disorders prior covid-19 (for covid-19 survivor subgroup)

inclusion criteria: informed consent from the parents or a legally acceptable representative for an underage participant for students, aged 3 years or above biological parents of students enrolled in the trial or unrelated healthy adults ability to adhere to the follow-up schedules willingness to report reactogenicity daily for 7 days post dose 1 and 2 (and 3) proactively willingness to receive that vaccine available for that particular recruitment period (as student-parent pair, if applicable) good past health, including pre-existing clinically stable disease, such as paediatric or immune disorders prior covid-19 (for covid-19 survivor subgroup)

inclusion criteria: informed consent from the parents or a legally acceptable representative for an underage participant for students, aged 3 years or above biological parents of students enrolled in the trial or unrelated healthy adults ability to adhere to the follow-up schedules willingness to report reactogenicity daily for 7 days post dose 1 and 2 (and 3) proactively willingness to receive that vaccine available for that particular recruitment period (as student-parent pair, if applicable) good past health, including pre-existing clinically stable disease, such as paediatric or immune disorders prior covid-19 (for covid-19 survivor subgroup)

inclusion criteria: informed consent from the parents or a legally acceptable representative for an underage participant for students, aged 11 years or above biological parents of students enrolled in the trial or unrelated healthy adults ability to adhere to the follow-up schedules willingness to report reactogenicity daily for 7 days post dose 1 and 2 (and 3) proactively willingness to receive that vaccine available for that particular recruitment period (as student-parent pair, if applicable) good past health, including pre-existing clinically stable disease, such as paediatric or immune disorders prior covid-19 (for covid-19 survivor subgroup)

inclusion criteria: informed consent from the parents or a legally acceptable representative for an underage participant for students, aged 11 years or above biological parents of students enrolled in the trial or unrelated healthy adults ability to adhere to the follow-up schedules willingness to report reactogenicity daily for 7 days post dose 1 and 2 (and 3) proactively willingness to receive that vaccine available for that particular recruitment period (as student-parent pair, if applicable) good past health, including pre-existing clinically stable disease, such as paediatric or immune disorders prior covid-19 (for covid-19 survivor subgroup)

inclusion criteria: 1. informed consent from the parents or a legally acceptable representative for an underage participant 2. for students, aged 11 years or above 3. biological parents of students enrolled in the trial or unrelated healthy adults 4. ability to adhere to the follow-up schedules 5. willingness to report reactogenicity daily for 7 days post dose 1 and 2 (and 3) proactively 6. willingness to receive that vaccine available for that particular recruitment period (as student-parent pair, if applicable) 7. good past health, including pre-existing clinically stable disease, such as paediatric or immune disorders 8. prior covid-19 (for covid-19 survivor subgroup)

inclusion criteria: 1. informed consent from the parents or a legally acceptable representative for an underage participant 2. for students, aged 11 years or above 3. biological parents of students enrolled in the trial or unrelated healthy adults 4. ability to adhere to the follow-up schedules 5. willingness to report reactogenicity daily for 7 days post dose 1 and 2 (and 3) proactively 6. willingness to receive that vaccine available for that particular recruitment period (as student-parent pair, if applicable) 7. good past health, including pre-existing clinically stable disease, such as paediatric or immune disorders 8. prior covid-19 (for covid-19 survivor subgroup)

inclusion criteria: 1. informed consent from the parents or a legally acceptable representative for an underage participant 2. for students, aged 11-16 years, inclusive 3. biological parents of students enrolled in the trial 4. ability to adhere to the follow-up schedules 5. willingness to report reactogenicity daily for 7 days post dose 1 and 2 proactively 6. willingness to receive that vaccine available for that particular recruitment period as student-parent pair 7. good past health, including pre-existing clinically stable disease

inclusion criteria: 1. informed consent from the parents or a legally acceptable representative for an underage participant 2. for students, aged 11-16 years, inclusive 3. biological parents of students enrolled in the trial 4. ability to adhere to the follow-up schedules 5. willingness to report reactogenicity daily for 7 days post dose 1 and 2 proactively 6. willingness to receive that vaccine available for that particular recruitment period as student-parent pair 7. good past health, including pre-existing clinically stable disease