inclusion criteria: * age range: healthy people aged 3 years and and older who can provide legal identification; * the subject and/or his legal guardian and/or his entrusted person can understand the study procedures and informed consent, voluntarily sign informed consent form, and be able to comply with the requirements of the clinical study protocol; * inquired about medical history and physical examination, the investigator judged that the health condition is good; * no history of sars-cov-2 vaccination before enrollment; * females of childbearing age (menarche to menopause) are not pregnant at the time of enrollment (negative urine pregnancy test), not breastfeeding, and have no birth plan within 12 months after enrollment; effective contraception will be taken within 2 weeks before enrollment; * during the entire study follow-up period, be able and willing to complete the entire prescribed study plan.

inclusion criteria: * age range: healthy people aged 3 years and and older who can provide legal identification; * the subject and/or his legal guardian and/or his entrusted person can understand the study procedures and informed consent, voluntarily sign informed consent form, and be able to comply with the requirements of the clinical study protocol; * inquired about medical history and physical examination, the investigator judged that the health condition is good; * no history of sars-cov-2 vaccination before enrollment; * females of childbearing age (menarche to menopause) are not pregnant at the time of enrollment (negative urine pregnancy test), not breastfeeding, and have no birth plan within 12 months after enrollment; effective contraception will be taken within 2 weeks before enrollment; * during the entire study follow-up period, be able and willing to complete the entire prescribed study plan.

inclusion criteria: - age range: healthy people aged 3 years and and older who can provide legal identification; - the subject and/or his legal guardian and/or his entrusted person can understand the study procedures and informed consent, voluntarily sign informed consent form, and be able to comply with the requirements of the clinical study protocol; - inquired about medical history and physical examination, the investigator judged that the health condition is good; - no history of sars-cov-2 vaccination before enrollment; - females of childbearing age (menarche to menopause) are not pregnant at the time of enrollment (negative urine pregnancy test), not breastfeeding, and have no birth plan within 12 months after enrollment; effective contraception will be taken within 2 weeks before enrollment; - during the entire study follow-up period, be able and willing to complete the entire prescribed study plan.

inclusion criteria: - age range: healthy people aged 3 years and and older who can provide legal identification; - the subject and/or his legal guardian and/or his entrusted person can understand the study procedures and informed consent, voluntarily sign informed consent form, and be able to comply with the requirements of the clinical study protocol; - inquired about medical history and physical examination, the investigator judged that the health condition is good; - no history of sars-cov-2 vaccination before enrollment; - females of childbearing age (menarche to menopause) are not pregnant at the time of enrollment (negative urine pregnancy test), not breastfeeding, and have no birth plan within 12 months after enrollment; effective contraception will be taken within 2 weeks before enrollment; - during the entire study follow-up period, be able and willing to complete the entire prescribed study plan.