Phase I Trial of a Recombinant COVID-19 Vaccine (CHO Cell)

ABSTRACT

ConditionCOVID-19

InterventionBiological Two doses of middle-dose recombinant SARS-CoV-2 vaccine (CHO Cell) at the schedule of day 0, 14;Biological Three doses of middle-dose recombinant SARS-CoV-2 vaccine (CHO Cell) at the schedule of day 0, 14, 28;Biological Two doses of high-dose recombinant SARS-CoV-2 vaccine (CHO Cell) at the schedule of day 0, 14;Biological Three doses of high-dose recombinant SARS-CoV-2 vaccine (CHO Cell) at the schedule of day 0, 14, 28;Biological Two doses of placebo at the schedule of day 0, 14 #middle-dose group; Biological Three doses of placebo at the schedule of day 0, 14, 28 #middle-dose group; Biological Two doses of placebo at the schedule of day 0, 14 #High-dose group; Biological Three doses of placebo at the schedule of day 0, 14, 28 #High-dose group#

Primary outcome:The proportion of adverse reactions (AR) up to Day 28 after prime and boost vaccination of the recombinant SARS-CoV-2 vaccine (CHO cell) or placebo.

Criteria
Inclusion Criteria

- Healthy subjects of = 18 years old.

- The subject can understand and voluntarily sign the informed consent.

- The subject can The subject canprovide legal identification.

Exclusion Criteria

- Have a history of close contact with a confirmed case of SARS-CoV-2, an asymptomatic
infection in the previous 14 days, or a travel history/residential history in a
community where a case has been reported.

- Have a history of contact with a person infected with SARS-CoV-2(a person with a
positive nucleic acid test) in the previous 14 days.

- Patients with fever or respiratory symptoms who have been to middle or high-risk areas
in the past 14 days or have exit history, or come from communities with case reports.

- In the past 14 days, there have been 2 or more cases of fever and/or respiratory
symptoms in small areas such as homes, offices, school classes, etc.

- Have a history of SARS.

- Have a history of SARS-CoV-2 infection.

- Positive in SARS-CoV-2 IgG or IgM antibody screening.

- Positive in RT-PCR test of SARS-CoV-2 in throat swab.

- Positive in HIVantibody screening.

- Women who are breastfeeding, pregnant, or planning to become pregnant during the study
period (based on the subject's self-report and blood pregnancy test results for women
of childbearing age), or men who plan to conceive their partners during the study
period.

- Subjects with body mass index (BMI) =35 kg/m2.

- Have a history of asthma, a history of vaccine or vaccine component allergy, have
serious adverse reactions to the vaccine, such as urticaria, dyspnea, angioedema.

- Subjects with congenital malformations or developmental disorders, genetic defects,
severe malnutrition, etc.

- Subjects with autoimmune diseases or immunodeficiency/immunosuppression.

- Subjects with severe chronic diseases, severe cardiovascular diseases, hypertension
and diabetes that cannot be controlled by drugs, liver and kidney diseases, malignant
tumors, etc.

- Subjects with severe neurological disease (epilepsy, convulsions or convulsions) or
mental illness.

- Subjects with thyroid disease or history of thyroidectomy, no spleen, functional
asthenia, and any spleen or splenectomy caused by any condition.

- Abnormal blood coagulation function diagnosed by a doctor (such as coagulation factor
deficiency, coagulopathy, abnormal platelet) or obvious bruise or coagulation
disorder.

- Have received immunosuppressant therapy, cytotoxic therapy, and inhaled
corticosteroids in the past 6 months (excluding corticosteroid spray therapy for
allergic rhinitis and surface corticosteroid therapy for acute non-complicated
dermatitis).

- Physical examination or chest CT imaging reveals clinically significant abnormalities.

- Abnormal laboratory test results such as hematology and biochemistry that are beyond
the reference value range and have clinical significance.

1. Routine blood test white blood cell count, hemoglobin, platelet count.

2. Blood biochemical index detection alanine aminotransferase (ALT), aspartate
aminotransferase (AST), fasting blood glucose, C-reactive protein, total
bilirubin (TBIL), creatinine (CR), creatine phosphokinase (CPK).

3. Urine routine indicators urine protein (PRO), urine sugar, urine red blood
cells.

4. Coagulation function test prothrombin time (PT), activated partial
thromboplastin time (APTT), thrombin time (TT), fibrinogen (FIB).

- Have a long history of alcohol or drug abuse.

- Received blood products within 3 months before receiving trial vaccine.

- Received other study drugs within 30 days before receiving the trail vaccine.

- Received a live attenuated vaccine within 14 days before receiving the experimental
vaccine.

- Received a subunit or inactivated vaccine within 7 days before receiving the
experimental vaccine.

- Various acute or chronic diseases occurred in the past 7 days.

- Axillary body temperature>37.0? before vaccination.

- According to the judgment of the investigator, the subject has any other factors that
are not suitable for participating in the clinical trial.

Exclusion criteria of subsequent dose

If one of the following (1) to (4) adverse events (AE) occurs, the vaccination is
prohibited, but other research steps can be continued according to the investigator's
judgment; if one of the following (5), (6) adverse events occurs , The investigator will
judge whether to inoculate; if one of the following events (7) to (10) occurs, the
vaccination can be postponed within the time window specified in the plan.

- (1)The subjects used the same vaccine other than the experimental vaccine during the
study.

- (2)Any serious adverse reactions that are causally related to vaccination.

- (3)Severe allergic or hypersensitivity reactions after vaccination (including
urticaria/skin rash within 30 minutes after vaccination).

- (4)Any confirmed or suspected autoimmune disease or immunodeficiency disease,
including human immunodeficiency virus (HIV) infection.

- (5)Acute or new-onset chronic disease after vaccination.

- (6)Other reactions (including severe pain, severe swelling, severe activity
limitation, persistent high fever, severe headache, or other systemic or local
reactions) are judged by the investigator.

- (7)Acute illness at the time of vaccination (Acute illness refers to moderate or
severe illness with or without fever).

- (8)Axillary temperature >37.0? before vaccination.

- (9)Vaccination of subunit vaccine or inactivated vaccine within 7 days, live
attenuated vaccine within 14 days.

- (10)According to the investigator's judgment, the subject has any other factors that
are not suitable for vaccination.