1) Persons with full capacity for civil conduct aged >=60 years, 2) Subjects voluntarily agree to participate in the research and sign an informed consent form, and can provide valid identification, understand and comply with the requirements of the trial protocol, have the ability to understand (non-illiterate) research procedures and participate in the planned follow-up, 3) Axillary body temperature <37.3 Degree C, 4) Female subjects and male subjects of childbearing age agree to take effective contraceptive measures during the study period.

1) Persons with full capacity for civil conduct aged >=60 years, 2) Subjects voluntarily agree to participate in the research and sign an informed consent form, and can provide valid identification, understand and comply with the requirements of the trial protocol, have the ability to understand (non-illiterate) research procedures and participate in the planned follow-up, 3) Axillary body temperature <37.3 Degree C, 4) Female subjects and male subjects of childbearing age agree to take effective contraceptive measures during the study period.