1) Thai people with age equal or more than 18-year-old 2) Confirmed COVID-19 with 1 or more of the following symptoms, fever, runny nose, cough, myalgia, sore throat, dyspnea, chest discomfort, or chest pain within 7 days after onset of illness 3) Asymptomatic COVID-19 4) Accept to perform chest CT 5) Communicable with staff in Thai 6) Accept the follow-up schedule 7) Nasopharyngeal swab or oropharyngeal swab detected ORF1 a/b gene E gene from SARS-CoV-2 PCR with Ct value less than 35 8) No meet WHO criteria for hospitalization 9) Accept the informed consent

1) Thai people with age equal or more than 18-year-old 2) Confirmed COVID-19 with 1 or more of the following symptoms, fever, runny nose, cough, myalgia, sore throat, dyspnea, chest discomfort, or chest pain within 7 days after onset of illness 3) Asymptomatic COVID-19 4) Accept to perform chest CT 5) Communicable with staff in Thai 6) Accept the follow-up schedule 7) Nasopharyngeal swab or oropharyngeal swab detected ORF1 a/b gene E gene from SARS-CoV-2 PCR with Ct value less than 35 8) No meet WHO criteria for hospitalization 9) Accept the informed consent