those who have had surgery within 8 weeks prior to screening or who have surgery planned during the trial, and the investigator believes that such surgery may bring potential risks to the subjects. prior to administration of the investigational drug, use of the following drugs or therapies: i. any prescription drug within 28 days. ii. any over-the-counter drug, including health care products within 7 days. prior history or current evidence of serious disease or chronic disease of the respiratory system, circulatory system, digestive system, urinary system, reproductive system, nervous system, immune system, hematology, psychiatry, and dermatology, etc, or any disease that may interfere with the trial results. subjects with coronavirus disease 2019 (covid-19) or recovered from it or subjects positive for severe acute respiratory syndrome coronavirus 2 (sars-cov-2) nucleic acid or serum sars-cov-2 specific antibodies. subjects who are with known history of allergies to any ingredient of the investigational drug, or similar drugs, or subjects with allergic constitution (previously sensitive to ≥ 2 foods or drugs). subjects with any positive test of hepatitis b surface antigen (hbsag), hepatitis c virus (hcv) antibody, treponema pallidum antibody, or human immunodeficiency virus (hiv) antibody. subjects with alcohol abuse or tobacco abuse, or alcohol blood test results exceeding the upper limit of the normal range. alcohol abuse is defined as: alcohol consumption of more than 14 u (1 u = 350 ml of beer, or 45 ml of liquor, or 150 ml of wine) per week within 3 months prior to screening. tobacco abuse is defined as: smoking ≥5 cigarettes per day on average within 3 months prior to screening. female subjects (including partners) who plan to be pregnant within one year upon screening, or pregnant or breast-feeding female subjects. subjects with a history of drug addiction or drug abuse, or with positive urine screen test results for drug. subjects donating whole blood or blood components, or with massive hemorrhage (\>400 ml), within 3 months prior to screening. prior vaccination with sars-cov-2 vaccine or participation in a sars-cov-2 neutralizing antibody clinical trial. participation in any other clinical study with pharmacological intervention within 3 months prior to screening, or the drug is still within the elimination period (5 half-lives) prior to screening, whichever is longer. vaccination within 12 weeks prior to screening, or planned vaccination during the study and within 12 weeks after the end of the study. subjects with a history of fainting at the sight of blood or puncture. subjects who are not suitable to participate in the clinical trial as considered by the investigator or cannot complete the study for any other reasons.

those who have had surgery within 8 weeks prior to screening or who have surgery planned during the trial, and the investigator believes that such surgery may bring potential risks to the subjects. prior to administration of the investigational drug, use of the following drugs or therapies: i. any prescription drug within 28 days. ii. any over-the-counter drug, including health care products within 7 days. prior history or current evidence of serious disease or chronic disease of the respiratory system, circulatory system, digestive system, urinary system, reproductive system, nervous system, immune system, hematology, psychiatry, and dermatology, etc, or any disease that may interfere with the trial results. subjects with coronavirus disease 2019 (covid-19) or recovered from it or subjects positive for severe acute respiratory syndrome coronavirus 2 (sars-cov-2) nucleic acid or serum sars-cov-2 specific antibodies. subjects who are with known history of allergies to any ingredient of the investigational drug, or similar drugs, or subjects with allergic constitution (previously sensitive to ≥ 2 foods or drugs). subjects with any positive test of hepatitis b surface antigen (hbsag), hepatitis c virus (hcv) antibody, treponema pallidum antibody, or human immunodeficiency virus (hiv) antibody. subjects with alcohol abuse or tobacco abuse, or alcohol blood test results exceeding the upper limit of the normal range. alcohol abuse is defined as: alcohol consumption of more than 14 u (1 u = 350 ml of beer, or 45 ml of liquor, or 150 ml of wine) per week within 3 months prior to screening. tobacco abuse is defined as: smoking ≥5 cigarettes per day on average within 3 months prior to screening. female subjects (including partners) who plan to be pregnant within one year upon screening, or pregnant or breast-feeding female subjects. subjects with a history of drug addiction or drug abuse, or with positive urine screen test results for drug. subjects donating whole blood or blood components, or with massive hemorrhage (\>400 ml), within 3 months prior to screening. prior vaccination with sars-cov-2 vaccine or participation in a sars-cov-2 neutralizing antibody clinical trial. participation in any other clinical study with pharmacological intervention within 3 months prior to screening, or the drug is still within the elimination period (5 half-lives) prior to screening, whichever is longer. vaccination within 12 weeks prior to screening, or planned vaccination during the study and within 12 weeks after the end of the study. subjects with a history of fainting at the sight of blood or puncture. subjects who are not suitable to participate in the clinical trial as considered by the investigator or cannot complete the study for any other reasons.

those who have had surgery within 8 weeks prior to screening or who have surgery planned during the trial, and the investigator believes that such surgery may bring potential risks to the subjects. prior to administration of the investigational drug, use of the following drugs or therapies: i. any prescription drug within 28 days. ii. any over-the-counter drug, including health care products within 7 days. prior history or current evidence of serious disease or chronic disease of the respiratory system, circulatory system, digestive system, urinary system, reproductive system, nervous system, immune system, hematology, psychiatry, and dermatology, etc, or any disease that may interfere with the trial results. subjects with coronavirus disease 2019 (covid-19) or recovered from it or subjects positive for severe acute respiratory syndrome coronavirus 2 (sars-cov-2) nucleic acid or serum sars-cov-2 specific antibodies. subjects who are with known history of allergies to any ingredient of the investigational drug, or similar drugs, or subjects with allergic constitution (previously sensitive to ≥ 2 foods or drugs). subjects with any positive test of hepatitis b surface antigen (hbsag), hepatitis c virus (hcv) antibody, treponema pallidum antibody, or human immunodeficiency virus (hiv) antibody. subjects with alcohol abuse or tobacco abuse, or alcohol blood test results exceeding the upper limit of the normal range. alcohol abuse is defined as: alcohol consumption of more than 14 u (1 u = 350 ml of beer, or 45 ml of liquor, or 150 ml of wine) per week within 3 months prior to screening. tobacco abuse is defined as: smoking ≥5 cigarettes per day on average within 3 months prior to screening. female subjects (including partners) who plan to be pregnant within one year upon screening, or pregnant or breast-feeding female subjects. subjects with a history of drug addiction or drug abuse, or with positive urine screen test results for drug. subjects donating whole blood or blood components, or with massive hemorrhage (>400 ml), within 3 months prior to screening. prior vaccination with sars-cov-2 vaccine or participation in a sars-cov-2 neutralizing antibody clinical trial. participation in any other clinical study with pharmacological intervention within 3 months prior to screening, or the drug is still within the elimination period (5 half-lives) prior to screening, whichever is longer. vaccination within 12 weeks prior to screening, or planned vaccination during the study and within 12 weeks after the end of the study. subjects with a history of fainting at the sight of blood or puncture. subjects who are not suitable to participate in the clinical trial as considered by the investigator or cannot complete the study for any other reasons.

those who have had surgery within 8 weeks prior to screening or who have surgery planned during the trial, and the investigator believes that such surgery may bring potential risks to the subjects. prior to administration of the investigational drug, use of the following drugs or therapies: i. any prescription drug within 28 days. ii. any over-the-counter drug, including health care products within 7 days. prior history or current evidence of serious disease or chronic disease of the respiratory system, circulatory system, digestive system, urinary system, reproductive system, nervous system, immune system, hematology, psychiatry, and dermatology, etc, or any disease that may interfere with the trial results. subjects with coronavirus disease 2019 (covid-19) or recovered from it or subjects positive for severe acute respiratory syndrome coronavirus 2 (sars-cov-2) nucleic acid or serum sars-cov-2 specific antibodies. subjects who are with known history of allergies to any ingredient of the investigational drug, or similar drugs, or subjects with allergic constitution (previously sensitive to ≥ 2 foods or drugs). subjects with any positive test of hepatitis b surface antigen (hbsag), hepatitis c virus (hcv) antibody, treponema pallidum antibody, or human immunodeficiency virus (hiv) antibody. subjects with alcohol abuse or tobacco abuse, or alcohol blood test results exceeding the upper limit of the normal range. alcohol abuse is defined as: alcohol consumption of more than 14 u (1 u = 350 ml of beer, or 45 ml of liquor, or 150 ml of wine) per week within 3 months prior to screening. tobacco abuse is defined as: smoking ≥5 cigarettes per day on average within 3 months prior to screening. female subjects (including partners) who plan to be pregnant within one year upon screening, or pregnant or breast-feeding female subjects. subjects with a history of drug addiction or drug abuse, or with positive urine screen test results for drug. subjects donating whole blood or blood components, or with massive hemorrhage (>400 ml), within 3 months prior to screening. prior vaccination with sars-cov-2 vaccine or participation in a sars-cov-2 neutralizing antibody clinical trial. participation in any other clinical study with pharmacological intervention within 3 months prior to screening, or the drug is still within the elimination period (5 half-lives) prior to screening, whichever is longer. vaccination within 12 weeks prior to screening, or planned vaccination during the study and within 12 weeks after the end of the study. subjects with a history of fainting at the sight of blood or puncture. subjects who are not suitable to participate in the clinical trial as considered by the investigator or cannot complete the study for any other reasons.