Patients
SARS-CoV-2 infection
SARS-COV-2 INFECTION
We prospectively identified patients aged between 20 and 75 years with SARS-CoV-2 infection confirmed by a positive reverse transcription-polymerase chain reaction (RT-PCR) or SARS-CoV-2 antigen tests that were approved by the Ministry of Health, Labour and Welfare in Japan. Inclusion criteria were mild-to-moderate COVID-19 without the need for oxygen support. Exclusion criteria were an SpO