Patient Inclusion Criteria

- Aged between 18 and 60 years. - Able to understand the content of informed consent and willing to sign the informed consent - Able and willing to complete all the secluded study process during the whole 6 months study follow-up period. - Negative in HIV diagnostic test. - Negative in serum antibodies (IgG and IgM) screening of COVID-19. - Axillary temperature ≤37.0°C. - The BMI index is 18.5-30.0. - General good health as established by medical history and physical examination.

Patient Exclusion Criteria

- Family history of seizure, epilepsy, brain or mental disease - Subject allergic to any component of the investigational vaccine, or a more severe allergic reaction and history of allergies in the past. - Woman who is pregnant, breast-feeding or positive in β-HCG (human chorionic gonadotropin) pregnancy test (urine) on day of enrollment, or become pregnant during the next 6 months - Any acute fever disease or infections. - History of SARS - Major congenital defects or not well-controlled chronic illness, such as asthma, diabetes, or thyroid disease. - Serious cardiovascular diseases, such as arrhythmia, conduction block, myocardial infarction, severe hypertension without controllable drugs, etc. - Hereditary angioneurotic edema or acquired angioneurotic edema - Urticaria in last one year - No spleen or functional spleen. - Platelet disorder or other bleeding disorder may cause injection contraindication - Faint at the sight of needles. - Prior administration of immunodepressant or corticosteroids, antianaphylaxis treatment, cytotoxic treatment in last 6 months. - Prior administration of blood products in last 4 months - Prior administration of other research medicines in last 1 month - Prior administration of attenuated vaccine in last 1 month - Prior administration of inactivated vaccine in last 14 days - Current anti-tuberculosis prophylaxis or therapy - According to the judgement of investigator,various medical, psychological, social or other conditions, those could affect the subjects to sign informed consent.