(1) Age: 18 to 74 years (at the time of informed consent) (2) Gender: Male or female (3) Patients who meet all of the following criteria 1), 2), and 3) at the time of enrollment 3.1) Patients with SARS-CoV-2-positive airway specimens such as nasopharyngeal swab, nasal aspirate, or airway aspirate by RT-PCR test 3.2) Patients without new lung lesions on chest images that are compatible with pneumonia 3.3) Patients with a fever of 37.5°C or more (4) For premenopausal female patients, patients who have been confirmed to be negative on a pregnancy test before administration of the study drug (5) Patients who understand the contents of this study and are able to provide written consent by themselves without assistance, or as appropriate with their assent and consent of their parents

(1) Age: 18 to 74 years (at the time of informed consent) (2) Gender: Male or female (3) Patients who meet all of the following criteria 1), 2), and 3) at the time of enrollment 3.1) Patients with SARS-CoV-2-positive airway specimens such as nasopharyngeal swab, nasal aspirate, or airway aspirate by RT-PCR test 3.2) Patients without new lung lesions on chest images that are compatible with pneumonia 3.3) Patients with a fever of 37.5°C or more (4) For premenopausal female patients, patients who have been confirmed to be negative on a pregnancy test before administration of the study drug (5) Patients who understand the contents of this study and are able to provide written consent by themselves without assistance, or as appropriate with their assent and consent of their parents