1)Patients with recurrence or reinfection of COVID-192) Patients who are asymptomatic or whose onset date of various symptoms due to COVID-19 cannot be specified3) Patients suspected of having infection with microorganisms other than SARS-CoV-2 requiring treatment4) Patients with hyperkalemia or hyponatremia5) Patients undergoing or planning treatment for malignant tumors6) Patients with severe liver dysfunction or renal dysfunction requiring dialysis7) Patients with impaired consciousness such as disorientation8)Patients who are pregnant or who may be pregnant9) Patients with weakened immune system10)Patients with a history of hypersensitivity to Nafamostat Mesilate11)Patients who are considered inappropriate for inclusion in the study by the investigator

1)Patients with recurrence or reinfection of COVID-192) Patients who are asymptomatic or whose onset date of various symptoms due to COVID-19 cannot be specified3) Patients suspected of having infection with microorganisms other than SARS-CoV-2 requiring treatment4) Patients with hyperkalemia or hyponatremia5) Patients undergoing or planning treatment for malignant tumors6) Patients with severe liver dysfunction or renal dysfunction requiring dialysis7) Patients with impaired consciousness such as disorientation8)Patients who are pregnant or who may be pregnant9) Patients with weakened immune system10)Patients with a history of hypersensitivity to Nafamostat Mesilate11)Patients who are considered inappropriate for inclusion in the study by the investigator