Because the contagiousness of the novel coronavirus disease 2019 (COVID-19) begins 2 3 to 0 7 days before the onset of the disease, all people with SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2) have been diagnosed with Early detection of COVID-19 patients, isolation, contact with the person in contact with the patient, and disinfection of high contact areas should be performed It is also important for health care workers to refrain from participating in enclosed, congested, and confined spaces in the workplace and outside the workplace In particular, it is important to maintain physical distance between people and to use masks when that distance cannot be maintained