1. subjects with the lab-confirmed medical history of covid-19, including nucleic acid (pcr testing of nasopharyngeal samples) tested positive or antibody igg/igm tested positive. 2. subjects with the novel onset of pyrexia/cough/shortness of breath/diarrhea or history of contact with confirmed covid-19 individuals (positive for sars-cov-2 nucleic acid) within the 14 days before randomization. 3. subjects who are known to have chronic obstructive pulmonary disease (copd), cirrhosis of liver, cardiac failure or any condition that requires active medical intervention or monitoring to avert serious danger to the participant's health or well-being. 4. subjects with pneumonia or tuberculosis (tb) suggested by chest x-ray. 5. subjects with previous exposure to a mab or any other biological agents in 6 months before screening. 6. subjects with previous exposure to vaccines in 3 months before screening, or who plans to receive vaccination during the study period or in 3 months after the study. 7. subjects with previous participation in clinical trials receiving investigational drug/comparator within the longer of 30 days or 5 half-lives before screening. 8. subjects who are known to have a history of allergy to any mab, biological product, protein product, or the ingredient of the ip. 9. subjects with positive test result(s) for hepatitis b virus (positive for hbsag or positive for hbcab and hbv-dna), hepatitis c virus (hcv) antibodies, human immunodeficiency virus (hiv) antibodies, or treponema pallidum. 10. subjects who are known to have a history of psychotropic drug abuse, alcoholism, or drug addiction within the last year. 11. subjects with a history of a blood donation within 3 months before screening. 12. subjects with the use of any prescription drug, otc drug, or traditional chinese medicine in 14 days before screening. 13. females who are pregnant or breastfeeding 14. other factors that the investigator deems inappropriate for participation in the study.

1. subjects with the lab-confirmed medical history of covid-19, including nucleic acid (pcr testing of nasopharyngeal samples) tested positive or antibody igg/igm tested positive. 2. subjects with the novel onset of pyrexia/cough/shortness of breath/diarrhea or history of contact with confirmed covid-19 individuals (positive for sars-cov-2 nucleic acid) within the 14 days before randomization. 3. subjects who are known to have chronic obstructive pulmonary disease (copd), cirrhosis of liver, cardiac failure or any condition that requires active medical intervention or monitoring to avert serious danger to the participant's health or well-being. 4. subjects with pneumonia or tuberculosis (tb) suggested by chest x-ray. 5. subjects with previous exposure to a mab or any other biological agents in 6 months before screening. 6. subjects with previous exposure to vaccines in 3 months before screening, or who plans to receive vaccination during the study period or in 3 months after the study. 7. subjects with previous participation in clinical trials receiving investigational drug/comparator within the longer of 30 days or 5 half-lives before screening. 8. subjects who are known to have a history of allergy to any mab, biological product, protein product, or the ingredient of the ip. 9. subjects with positive test result(s) for hepatitis b virus (positive for hbsag or positive for hbcab and hbv-dna), hepatitis c virus (hcv) antibodies, human immunodeficiency virus (hiv) antibodies, or treponema pallidum. 10. subjects who are known to have a history of psychotropic drug abuse, alcoholism, or drug addiction within the last year. 11. subjects with a history of a blood donation within 3 months before screening. 12. subjects with the use of any prescription drug, otc drug, or traditional chinese medicine in 14 days before screening. 13. females who are pregnant or breastfeeding 14. other factors that the investigator deems inappropriate for participation in the study.

subjects with the lab-confirmed medical history of covid-19, including nucleic acid (pcr testing of nasopharyngeal samples) tested positive or antibody igg/igm tested positive. subjects with the novel onset of pyrexia/cough/shortness of breath/diarrhea or history of contact with confirmed covid-19 individuals (positive for sars-cov-2 nucleic acid) within the 14 days before randomization. subjects who are known to have chronic obstructive pulmonary disease (copd), cirrhosis of liver, cardiac failure or any condition that requires active medical intervention or monitoring to avert serious danger to the participant's health or well-being. subjects with pneumonia or tuberculosis (tb) suggested by chest x-ray. subjects with previous exposure to a mab or any other biological agents in 6 months before screening. subjects with previous exposure to vaccines in 3 months before screening, or who plans to receive vaccination during the study period or in 3 months after the study. subjects with previous participation in clinical trials receiving investigational drug/comparator within the longer of 30 days or 5 half-lives before screening. subjects who are known to have a history of allergy to any mab, biological product, protein product, or the ingredient of the ip. subjects with positive test result(s) for hepatitis b virus (positive for hbsag or positive for hbcab and hbv-dna), hepatitis c virus (hcv) antibodies, human immunodeficiency virus (hiv) antibodies, or treponema pallidum. subjects who are known to have a history of psychotropic drug abuse, alcoholism, or drug addiction within the last year. subjects with a history of a blood donation within 3 months before screening. subjects with the use of any prescription drug, otc drug, or traditional chinese medicine in 14 days before screening. females who are pregnant or breastfeeding other factors that the investigator deems inappropriate for participation in the study.

subjects with the lab-confirmed medical history of covid-19, including nucleic acid (pcr testing of nasopharyngeal samples) tested positive or antibody igg/igm tested positive. subjects with the novel onset of pyrexia/cough/shortness of breath/diarrhea or history of contact with confirmed covid-19 individuals (positive for sars-cov-2 nucleic acid) within the 14 days before randomization. subjects who are known to have chronic obstructive pulmonary disease (copd), cirrhosis of liver, cardiac failure or any condition that requires active medical intervention or monitoring to avert serious danger to the participant's health or well-being. subjects with pneumonia or tuberculosis (tb) suggested by chest x-ray. subjects with previous exposure to a mab or any other biological agents in 6 months before screening. subjects with previous exposure to vaccines in 3 months before screening, or who plans to receive vaccination during the study period or in 3 months after the study. subjects with previous participation in clinical trials receiving investigational drug/comparator within the longer of 30 days or 5 half-lives before screening. subjects who are known to have a history of allergy to any mab, biological product, protein product, or the ingredient of the ip. subjects with positive test result(s) for hepatitis b virus (positive for hbsag or positive for hbcab and hbv-dna), hepatitis c virus (hcv) antibodies, human immunodeficiency virus (hiv) antibodies, or treponema pallidum. subjects who are known to have a history of psychotropic drug abuse, alcoholism, or drug addiction within the last year. subjects with a history of a blood donation within 3 months before screening. subjects with the use of any prescription drug, otc drug, or traditional chinese medicine in 14 days before screening. females who are pregnant or breastfeeding other factors that the investigator deems inappropriate for participation in the study.