Triage algorithm and KCDC classification criteria for clinical severity of COVID-19 in South Korea. Abbreviations: KCDC, Korea Centers for Disease Control and Prevention; RT-PCR, real-time reverse transcription polymerase chain reaction Figure legend: The Living Treatment Center is a quarantine facility for mild or asymptomatic COVID-19 patients who are unable to self-isolate at home. The patients were checked for vital signs twice a day and immediately transferred to hospitals if their symptoms worsened. If their symptoms resolved, the patient was tested according to the standards for lifting the quarantine. Certain state-run facilities and accommodations are designated as Living Treatment Centers and are supplied with medical staff, medical equipment (pulse oximetry device, thermometer, blood pressure monitor, CPR kit, chest X-ray radiograph, etc.), individual relief kits (underwear, toiletries, face masks, etc.), and hygiene kits (thermometer and medical supplies).