inclusion criteria: * health subjects aged ≥18 years * the subject can provide with informed consent and sign informed consent form (icf). * the subjects are able to and willing to comply with the requirements of the clinical trial program and could complete the 6-month follow-up of the study. * participants who have received three-dose of inactivated sars-cov-2 vaccine more than 6 months ago.

inclusion criteria: * health subjects aged ≥18 years * the subject can provide with informed consent and sign informed consent form (icf). * the subjects are able to and willing to comply with the requirements of the clinical trial program and could complete the 6-month follow-up of the study. * participants who have received three-dose of inactivated sars-cov-2 vaccine more than 6 months ago.

inclusion criteria: health subjects aged ≥18 years the subject can provide with informed consent and sign informed consent form (icf). the subjects are able to and willing to comply with the requirements of the clinical trial program and could complete the 6-month follow-up of the study. participants who have received three-dose of inactivated sars-cov-2 vaccine more than 6 months ago.

inclusion criteria: health subjects aged ≥18 years the subject can provide with informed consent and sign informed consent form (icf). the subjects are able to and willing to comply with the requirements of the clinical trial program and could complete the 6-month follow-up of the study. participants who have received three-dose of inactivated sars-cov-2 vaccine more than 6 months ago.