Male or Female aged above 18 years (inclusive) Phase I: Participants aged 18 to 45 years (both inclusive) Phase II: Participants aged above 18 years (inclusive) (Strata 1: 18 to 59 years (both inclusive), Strata 2: above 60 years (inclusive). Healthy participants as determined by medical history, physical examination, vital signs and clinical and laboratory examination. Test negative for SARS-CoV-2 infection by RT-PCR test at screening Test negative for -SARS-CoV-2 IgG antibody by serology test at screening Capable and willing to provide written informed consent prior to the performance of any study-specific procedures.

Male or Female aged above 18 years (inclusive) Phase I: Participants aged 18 to 45 years (both inclusive) Phase II: Participants aged above 18 years (inclusive) (Strata 1: 18 to 59 years (both inclusive), Strata 2: above 60 years (inclusive). Healthy participants as determined by medical history, physical examination, vital signs and clinical and laboratory examination. Test negative for SARS-CoV-2 infection by RT-PCR test at screening Test negative for -SARS-CoV-2 IgG antibody by serology test at screening Capable and willing to provide written informed consent prior to the performance of any study-specific procedures.