inclusion criteria: 1. written informed consent. 2. male and female adults in stable health conditions aged 18 - 64 at time of informed consent (participation of health care workers and risk groups will be prioritized) and male or female in stable health conditions aged ≥ 65 at time of informed consent. 3. either in good or stable health in the opinion of the investigator. participants may have underlying illness as long as their symptoms are medically controlled, and they are on a stable medication for the respective underlying illness for at least 8 weeks before screening and no changes are expected during the study. 4. body mass index 18.5 - 32.0 kg/m2 and weight \> 50 kg at screening. 5. non-pregnant, non-lactating female with negative pregnancy test. 6. females who agree to comply with the applicable contraceptive requirements of the protocol.

inclusion criteria: 1. written informed consent. 2. male and female adults in stable health conditions aged 18 - 64 at time of informed consent (participation of health care workers and risk groups will be prioritized) and male or female in stable health conditions aged ≥ 65 at time of informed consent. 3. either in good or stable health in the opinion of the investigator. participants may have underlying illness as long as their symptoms are medically controlled, and they are on a stable medication for the respective underlying illness for at least 8 weeks before screening and no changes are expected during the study. 4. body mass index 18.5 - 32.0 kg/m2 and weight \> 50 kg at screening. 5. non-pregnant, non-lactating female with negative pregnancy test. 6. females who agree to comply with the applicable contraceptive requirements of the protocol.

inclusion criteria: written informed consent. male and female adults in stable health conditions aged 18 - 64 at time of informed consent (participation of health care workers and risk groups will be prioritized) and male or female in stable health conditions aged ≥ 65 at time of informed consent. either in good or stable health in the opinion of the investigator. participants may have underlying illness as long as their symptoms are medically controlled, and they are on a stable medication for the respective underlying illness for at least 8 weeks before screening and no changes are expected during the study. body mass index 18.5 - 32.0 kg/m2 and weight > 50 kg at screening. non-pregnant, non-lactating female with negative pregnancy test. females who agree to comply with the applicable contraceptive requirements of the protocol.

inclusion criteria: written informed consent. male and female adults in stable health conditions aged 18 - 64 at time of informed consent (participation of health care workers and risk groups will be prioritized) and male or female in stable health conditions aged ≥ 65 at time of informed consent. either in good or stable health in the opinion of the investigator. participants may have underlying illness as long as their symptoms are medically controlled, and they are on a stable medication for the respective underlying illness for at least 8 weeks before screening and no changes are expected during the study. body mass index 18.5 - 32.0 kg/m2 and weight > 50 kg at screening. non-pregnant, non-lactating female with negative pregnancy test. females who agree to comply with the applicable contraceptive requirements of the protocol.