Inclusion Criteria:

- Male or Female 18-65 on the day of enrollment;

- Overall good health condition, with no significant abnormalities during screening
and/or pre medication physical examinations;

- Male subjects weighing ≥ 50.0kg; Female subjects with a weight of ≥ 45.0kg and a BMI
between 18.0-28.0kg/m2 (including boundary values);

- The subjects and their sexual partners did not have any family planning during the
study period, voluntarily took effective contraceptive measures, and did not have
plans to donate sperm or eggs; Or for surgical sterilization (female: bilateral
fallopian tube ligation, bilateral ovariectomy or hysterectomy; male: vas deferens
ligation or vas deferens blockage surgery);

- Volunteer to participate in the experiment, cooperate with the visit, and sign an
informed consent form before the start of the study.

Exclusion Criteria:

- Individuals who are known to be allergic to the investigational drug, any component
in the preparation, or other similar drugs;

- The test results of hepatitis B B surface antigen (HBsAg), hepatitis C antibody (HCV
Ab), HIV antibody (HIV Ab) or Treponema pallidum antibody were positive;

- Suffering from severe neurological disorders (epilepsy, seizures or convulsions) or
mental illness, with a family history of mental illness, and neurological and
psychiatric problems associated with various organic disorders;

- Abnormal coagulation function (such as coagulation factor deficiency, coagulation
disorders, platelet abnormalities) or obvious bruising or coagulation disorders
diagnosed by a doctor;

- Other uncontrolled chronic or severe disease history, including but not limited to
cardiovascular disease, hematological system disease, liver and kidney disease,
digestive system disease, respiratory system disease, malignant tumor, history of
major organ transplantation, or any other disease or physiological condition that
the researcher believes can interfere with the test results;

- The target injection site (deltoid muscle of the upper arm) may interfere with drug
administration or local reaction observation due to skin damage, inflammation,
ulcers, rashes, and scars;

- (Female subjects) who are pregnant (including those who have tested positive for
pregnancy) or are breastfeeding;

- Have received any SARS-CoV-2 neutralizing antibody injection that is already on the
market or in research before screening;

- Participated in clinical trials of other drugs or medical devices within 3 months
prior to screening;

- Individuals with a body temperature greater than 37.0 ℃ on the day of medication
(Day 1);

- 4 weeks prior to screening for clinically significant acute or chronic disease
exacerbations, or a history of surgery;

- It is known that there is a history of SARS CoV-2 infection within 3 months
(including positive detection of COVID-19 nucleic acid/antigen during enrollment and
screening) or COVID-19 vaccine has been vaccinated;

- Blood donation>400 mL or significant blood loss>400 mL within 3 months prior to
medication; Donate plasma or platelets within one month before medication;

- Within the first 6 months of screening, use of immunoglobulins or blood products,
immune modulators such as corticosteroids and thymosin α Or blood stimulating drugs;

- Received attenuated live vaccine within 14 days prior to screening, or received
subunit or inactivated vaccine within 7 days;

- Those who have used any prescription drugs, over-the-counter drugs, Chinese herbal
medicines, and functional vitamins within the first 14 days of screening;

- Smokers who smoke ≥ 5 cigarettes per day within the first 3 months of screening, or
who cannot guarantee giving up smoking during the trial period;

- The weekly alcohol consumption in the three months before screening was more than 14
drinking units (1 drinking unit=14g 100% alcohol=360mL beer, or 150mL wine; or 45mL
distilled wine/Baijiu), or alcohol abstinence was not allowed during the test, or
alcohol breath test was positive before enrollment;

- Have a history of drug abuse or dependence or recreational drug use within 2 years
prior to screening, or have a positive urine drug abuse screening before enrollment;

- According to the judgment of the researchers, the subjects have any other factors
that are not suitable for participating in clinical trials.