inclusion criteria: * healthy male or non-pregnant female between the age of 12 to 85 years at time of enrolment. * women of childbearing potential and men must agree to practice medically effective contraception from first vaccination until 3 months after the last vaccination. * able to understand the content and possible risks of informed consent and willing to sign the informed consent form (icf). * able to understand and agrees to comply with all study procedures and be available for all study visits. * ear temperature ≤ 38.0°c. * healthy participants who are determined by medical history, physical examination, and clinical judgment of the investigator to be eligible for inclusion in the study. in the investigator's clinical judgement, participant may have a stable and well-controlled comorbidity associated with an increased risk of progression to severe covid-19.

inclusion criteria: * healthy male or non-pregnant female between the age of 12 to 85 years at time of enrolment. * women of childbearing potential and men must agree to practice medically effective contraception from first vaccination until 3 months after the last vaccination. * able to understand the content and possible risks of informed consent and willing to sign the informed consent form (icf). * able to understand and agrees to comply with all study procedures and be available for all study visits. * ear temperature ≤ 38.0°c. * healthy participants who are determined by medical history, physical examination, and clinical judgment of the investigator to be eligible for inclusion in the study. in the investigator's clinical judgement, participant may have a stable and well-controlled comorbidity associated with an increased risk of progression to severe covid-19.

inclusion criteria: - healthy male or non-pregnant female between the age of 12 to 85 years at time of enrolment. - women of childbearing potential and men must agree to practice medically effective contraception from first vaccination until 3 months after the last vaccination. - able to understand the content and possible risks of informed consent and willing to sign the informed consent form (icf). - able to understand and agrees to comply with all study procedures and be available for all study visits. - ear temperature ≤ 38.0°c. - healthy participants who are determined by medical history, physical examination, and clinical judgment of the investigator to be eligible for inclusion in the study. in the investigator's clinical judgement, participant may have a stable and well-controlled comorbidity associated with an increased risk of progression to severe covid-19.

inclusion criteria: - healthy male or non-pregnant female between the age of 12 to 85 years at time of enrolment. - women of childbearing potential and men must agree to practice medically effective contraception from first vaccination until 3 months after the last vaccination. - able to understand the content and possible risks of informed consent and willing to sign the informed consent form (icf). - able to understand and agrees to comply with all study procedures and be available for all study visits. - ear temperature ≤ 38.0°c. - healthy participants who are determined by medical history, physical examination, and clinical judgment of the investigator to be eligible for inclusion in the study. in the investigator's clinical judgement, participant may have a stable and well-controlled comorbidity associated with an increased risk of progression to severe covid-19.