inclusion criteria: 1. subjects aged 18 years and above, including those with underlying diseases and immunocompromised subjects. 2. basic or booster immunization with covid-19 vaccine ≥6 months. 3. ≥3 months of sars-cov-2 infection history, or never infected. 4. have the ability to understand research procedures, with informed consent, voluntarily sign informed consent, and be able to comply with the requirements of clinical research protocols.

inclusion criteria: 1. subjects aged 18 years and above, including those with underlying diseases and immunocompromised subjects. 2. basic or booster immunization with covid-19 vaccine ≥6 months. 3. ≥3 months of sars-cov-2 infection history, or never infected. 4. have the ability to understand research procedures, with informed consent, voluntarily sign informed consent, and be able to comply with the requirements of clinical research protocols.

inclusion criteria: subjects aged 18 years and above, including those with underlying diseases and immunocompromised subjects. basic or booster immunization with covid-19 vaccine ≥6 months. ≥3 months of sars-cov-2 infection history, or never infected. have the ability to understand research procedures, with informed consent, voluntarily sign informed consent, and be able to comply with the requirements of clinical research protocols.

inclusion criteria: subjects aged 18 years and above, including those with underlying diseases and immunocompromised subjects. basic or booster immunization with covid-19 vaccine ≥6 months. ≥3 months of sars-cov-2 infection history, or never infected. have the ability to understand research procedures, with informed consent, voluntarily sign informed consent, and be able to comply with the requirements of clinical research protocols.