inclusion criteria: - participants must be japanese men and women and 18 to 55 years of age inclusive, at the time of signing the informed consent. - negative results from both sars-cov-2 qrt-pcr and serology tests - healthy by medical history, physical examination, and safety laboratory tests, according to the judgement of the investigators

inclusion criteria: - participants must be japanese men and women and 18 to 55 years of age inclusive, at the time of signing the informed consent. - negative results from both sars-cov-2 qrt-pcr and serology tests - healthy by medical history, physical examination, and safety laboratory tests, according to the judgement of the investigators