inclusion criteria: * sign informed consent. age ≥ 18 years old. covid-19 (nucleic acid test positive) was diagnosed before randomization. at least 1 symptom or sign of covid-19 at the time of being enrolled into the study(symptoms and signs related to covid-19 including cough, expectoration, dyspnea, fever, chills, fatigue, muscle soreness, diarrhea, headache, sore throat, stuffy nose, runny nose, etc.).

inclusion criteria: * sign informed consent. age ≥ 18 years old. covid-19 (nucleic acid test positive) was diagnosed before randomization. at least 1 symptom or sign of covid-19 at the time of being enrolled into the study(symptoms and signs related to covid-19 including cough, expectoration, dyspnea, fever, chills, fatigue, muscle soreness, diarrhea, headache, sore throat, stuffy nose, runny nose, etc.).

inclusion criteria: sign informed consent. age ≥ 18 years old. covid-19 (nucleic acid test positive) was diagnosed before randomization. at least 1 symptom or sign of covid-19 at the time of being enrolled into the study(symptoms and signs related to covid-19 including cough, expectoration, dyspnea, fever, chills, fatigue, muscle soreness, diarrhea, headache, sore throat, stuffy nose, runny nose, etc.).

inclusion criteria: sign informed consent. age ≥ 18 years old. covid-19 (nucleic acid test positive) was diagnosed before randomization. at least 1 symptom or sign of covid-19 at the time of being enrolled into the study(symptoms and signs related to covid-19 including cough, expectoration, dyspnea, fever, chills, fatigue, muscle soreness, diarrhea, headache, sore throat, stuffy nose, runny nose, etc.).