(1) Patients who have given written consent to participate in the study from themselves or their guardians.(2) Hospitalized patients with a confirmed diagnosis of COVID-19 by PCR or LAMP, antigen testing, or other methods.(3) Patients who meet all of the following requirements at the time of admission.1)Within 5 days of onset2) SpO2 of 95% or higher in room air3) Aged 40 years or older or have one of the following underlying diseasesRenal dysfunction, chronic obstructive pulmonary disease (COPD), cardiac disease, cerebrovascular disease, malignancy, obesity, diabetes, hypertension, immunosuppressed state.(4) 20 years of age or older at the time of obtaining consent.(5) A person who is infected for the first time

(1) Patients who have given written consent to participate in the study from themselves or their guardians.(2) Hospitalized patients with a confirmed diagnosis of COVID-19 by PCR or LAMP, antigen testing, or other methods.(3) Patients who meet all of the following requirements at the time of admission.1)Within 5 days of onset2) SpO2 of 95% or higher in room air3) Aged 40 years or older or have one of the following underlying diseasesRenal dysfunction, chronic obstructive pulmonary disease (COPD), cardiac disease, cerebrovascular disease, malignancy, obesity, diabetes, hypertension, immunosuppressed state.(4) 20 years of age or older at the time of obtaining consent.(5) A person who is infected for the first time

(1) Patients who have given written consent to participate in the study from themselves or their guardians.(2) Hospitalized patients with a confirmed diagnosis of COVID-19 by PCR or LAMP, antigen testing, or other methods.(3) Patients who meet all of the following requirements at the time of admission.1)Within 5 days of onset2) SpO2 of 95% or higher in room air3) Aged 60 years or older or have one of the following underlying diseasesRenal dysfunction, chronic obstructive pulmonary disease (COPD), cardiac disease, cerebrovascular disease, malignancy, obesity, diabetes, hypertension, immunosuppressed state.(4) 20 years of age or older at the time of obtaining consent.(5) A person who is infected for the first time

(1) Patients who have given written consent to participate in the study from themselves or their guardians.(2) Hospitalized patients with a confirmed diagnosis of COVID-19 by PCR or LAMP, antigen testing, or other methods.(3) Patients who meet all of the following requirements at the time of admission.1)Within 5 days of onset2) SpO2 of 95% or higher in room air3) Aged 60 years or older or have one of the following underlying diseasesRenal dysfunction, chronic obstructive pulmonary disease (COPD), cardiac disease, cerebrovascular disease, malignancy, obesity, diabetes, hypertension, immunosuppressed state.(4) 20 years of age or older at the time of obtaining consent.(5) A person who is infected for the first time

(1) Patients who have given written consent to participate in the study from themselves or their guardians.(2) Hospitalized patients with a confirmed diagnosis of COVID-19 by PCR or LAMP, antigen testing, or other methods.(3) Patients who meet all of the following requirements at the time of admission.1)Within 5 days of onset2) SpO2 of 95% or higher in room air3) Aged 60 years or older or have one of the following underlying diseasesRenal dysfunction, chronic obstructive pulmonary disease (COPD), cardiac disease, cerebrovascular disease, malignancy, obesity, diabetes, hypertension, immunosuppressed state.(4) 20 years of age or older at the time of obtaining consent.

(1) Patients who have given written consent to participate in the study from themselves or their guardians.(2) Hospitalized patients with a confirmed diagnosis of COVID-19 by PCR or LAMP, antigen testing, or other methods.(3) Patients who meet all of the following requirements at the time of admission.1)Within 5 days of onset2) SpO2 of 95% or higher in room air3) Aged 60 years or older or have one of the following underlying diseasesRenal dysfunction, chronic obstructive pulmonary disease (COPD), cardiac disease, cerebrovascular disease, malignancy, obesity, diabetes, hypertension, immunosuppressed state.(4) 20 years of age or older at the time of obtaining consent.