None

None

- subject has been infected with covid-19 or the nucleic-acid test has been positive for covid-19 before; - subject who has a medical history with hypersensitiveness, eclampsia, epilepsy, cerebropathia or neurological illness; - allergic to any ingredient of vaccine or with allergy history to any vaccine; - subjects with immunodeficency or suspected impairment of immunologic function (e.g. caused by hiv), or subjects are in the process of immunosuppressor therapy(taking orally injecting of steroid hormone); - administration of immunoglobulins within 30 days prior to this study; - acute febrile disease(temperature ≥ 37.0°c) or infectious disease; - have a clearly diagnosed history of thrombocytopenia or other coagulopathy, which might cause contraindications for subcutaneous injection; - any serious chronic illness, acute phase of chronic illness, patients with hypertension or diabetes uncontrollable by drugs; - any kind of infectious, purulent, or allergic skin diseases; - pregnant women, lactating women, or women planning to have a child within 3 months ; - any other factor that makes the investigator determines the subject is unsuitable for this study.

- subject has been infected with covid-19 or the nucleic-acid test has been positive for covid-19 before; - subject who has a medical history with hypersensitiveness, eclampsia, epilepsy, cerebropathia or neurological illness; - allergic to any ingredient of vaccine or with allergy history to any vaccine; - subjects with immunodeficency or suspected impairment of immunologic function (e.g. caused by hiv), or subjects are in the process of immunosuppressor therapy(taking orally injecting of steroid hormone); - administration of immunoglobulins within 30 days prior to this study; - acute febrile disease(temperature ≥ 37.0°c) or infectious disease; - have a clearly diagnosed history of thrombocytopenia or other coagulopathy, which might cause contraindications for subcutaneous injection; - any serious chronic illness, acute phase of chronic illness, patients with hypertension or diabetes uncontrollable by drugs; - any kind of infectious, purulent, or allergic skin diseases; - pregnant women, lactating women, or women planning to have a child within 3 months ; - any other factor that makes the investigator determines the subject is unsuitable for this study.