Patients
nontuberculous mycobacteriosis, infection, fever
INFECTION
All other treatments that attending physicians deemed necessary were allowed. The inclusion criteria were age ≥ 20 years at the time of enrolment, diagnosis of COVID-19 by polymerase chain reaction (PCR) or an antigen test, with fever defined as greater than or equal to 37.5°C, and provision of written informed consent. The threshold was 37.5°C because at that time the Japanese government recommended that anyone with a sustained fever of 37.5°C or higher seek medical attention. The exclusion criteria were: use of teprenone within 2 weeks prior to enrolment; a requirement for ventilation or extracorporeal membrane oxygenation; a concomitant active infection other than SARS-Co-2 (nontuberculous mycobacteriosis patients lacking progression for more than 1 month prior were excepted); lactating or pregnant women; and unidentified persons.