To evaluate the safety and tolerability of BAT2022 in healthy subjects.

This is a single-center, randomized, double-blind, placebo-controlled, dose-escalation clinical study to evaluate the pharmacokinetics, safety, tolerability, immunogenicity and pharmacodynamics of BAT2022 for Injection in healthy subjects.

: Inclusion Criteria:

1. Subjects who have signed the informed consent form prior to the study and have a full understanding of the content, process and possible adverse reactions;
2. Subjects who are willing and able to follow the visit and treatment specified in this study;
3. Subject (including partner) who is willing to have no pregnancy plan or sperm donation plan within the following 6 months (i.e., within 6 months after administration of the investigational product) and voluntarily take effective contraceptive measures;
4. Healthy male or female subjects aged 18 ~ 55 years (inclusive);
5. Subjects with body weight of 50 kg ~ 100 kg (inclusive);
6. Subjects with normal or abnormal physical examination without clinical significance;

Exclusion Criteria:

1. Subjects who have smoked more than 5 cigarettes per day three months prior to Screening;
2. Any subject with a current or past serious allergic reaction to food or drug, or serious allergic or allergic reaction to human, humanized or mouse monoclonal antibody;
3. Subjects with a history of alcoholism (14 units of alcohol per week: 1 unit = 285 mL of beer, or 25 mL of liquor, or 125 mL of wine);
4. Subjects who have donated blood or had massive blood loss (>450 mL) within three months prior to screening, or intend to donate blood or undergo surgery during the study;
5. Subjects who have taken any prescription drug, over-the-counter drug, any vitamin products or herbal medicines 28 days prior to Screening;
6. Subjects who have significant changes in diet or exercise habits 2 weeks prior to screening or from screening to administration;
7. Subjects who have used any biological products within 3 months prior to screening;
8. Subjects with clinical significance of abnormal heart assessed using Color Doppler echocardiography
9. Subjects with clinical significance of abnormal laboratory findings (hematology, urinalysis, serum chemistry, coagulation function, virology of infectious diseases and pregnancy test for women of childbearing age), or other clinical findings suggestive of the following disorders with clinical relevance (including but not limited to gastrointestinal, renal, hepatic, neurological, hematological, endocrine, oncological, pulmonary, immune, psychiatric or cardiovascular and cerebrovascular diseases);
10. Subjects with clinical significance of abnormal (as judged by the investigator) ECG, or QTcF > 450 ms (allowed to be repeated for once);
11. Subjects with acute illness or concomitant medication from screening to prior to administration of the investigational product;
12. Subjects with positive urine drug screen, or subjects with a history of drug abuse or drug use in the past 5 years;
13. Subjects who have taken any alcohol-containing products within 48 hours prior to administration of the investigational product, or who are unable to limit alcohol consumption as required during the course of the study;
14. Subjects with current or previous malignant tumours;
15. Subjects with a history of hypertension or systolic blood pressure ≥ 140 mmHg or diastolic blood pressure ≥ 90 mmHg at screening/baseline;
16. Subjects with liver disorder who are judged by the investigator as inappropriate for enrollment;
17. Subjects with abnormal focal shadows on chest radiograph, including but not limited to active pulmonary tuberculosis;
18. Subjects who have participated in drug clinical study within three months prior to the first dose of the investigational product, or planned to participate in other drug clinical study during the study;
19. Subjects who are considered by the investigator as inappropriate for enrollment.

Double-Blind