1) Aged >=18 years old at the time of enrollment, 2) Be able to comply with the requirements of the clinical research protocol, complete all trial procedures, and sign the informed consent form, 3) The nucleic acid test of SARS-CoV-2 is negative, 4) The serum total antibody test of SARS-CoV-2 is negative, 5) The lung CT imaging is normal (no imaging features of COVID-19), 6) The HIV screening result is negative, 7) For female subjects, they must have no pregnancy plan within 12 months after the first dose of vaccination and agree to use effective contraceptive measures.

1) Aged >=18 years old at the time of enrollment, 2) Be able to comply with the requirements of the clinical research protocol, complete all trial procedures, and sign the informed consent form, 3) The nucleic acid test of SARS-CoV-2 is negative, 4) The serum total antibody test of SARS-CoV-2 is negative, 5) The lung CT imaging is normal (no imaging features of COVID-19), 6) The HIV screening result is negative, 7) For female subjects, they must have no pregnancy plan within 12 months after the first dose of vaccination and agree to use effective contraceptive measures.