inclusion criteria: 1. adults aged 18 years and above with bmi of 18 to 30 (including boundary values); 2. volunteers are able and willing to comply with the requirements of the clinical trial protocol, and volunteers or witnesses can sign informed consent forms; 3. willing to discuss the medical history with the investigator or doctor and allow access to all medical records related to this trial; 4. provide 48-hour pcr negative report; 5. have not received any other covid-19 vaccines.

inclusion criteria: 1. adults aged 18 years and above with bmi of 18 to 30 (including boundary values); 2. volunteers are able and willing to comply with the requirements of the clinical trial protocol, and volunteers or witnesses can sign informed consent forms; 3. willing to discuss the medical history with the investigator or doctor and allow access to all medical records related to this trial; 4. provide 48-hour pcr negative report; 5. have not received any other covid-19 vaccines.

inclusion criteria: adults aged 18 years and above with bmi of 18 to 30 (including boundary values); volunteers are able and willing to comply with the requirements of the clinical trial protocol, and volunteers or witnesses can sign informed consent forms; willing to discuss the medical history with the investigator or doctor and allow access to all medical records related to this trial; provide 48-hour pcr negative report; have not received any other covid-19 vaccines.

inclusion criteria: adults aged 18 years and above with bmi of 18 to 30 (including boundary values); volunteers are able and willing to comply with the requirements of the clinical trial protocol, and volunteers or witnesses can sign informed consent forms; willing to discuss the medical history with the investigator or doctor and allow access to all medical records related to this trial; provide 48-hour pcr negative report; have not received any other covid-19 vaccines.