Two authors retrospectively reviewed the clinical and laboratory findings. For the review of the clinical features, initial symptoms such as fever, cough, sputum, rhinorrhea, sore throat, myalgia, headache, dizziness, vomiting, and diarrhea were recorded. In turn, patient symptom progression while under treatment was also reviewed. For review of the laboratory data, the hematological analysis of the white blood cell (WBC) count, red blood cell (RBC) count, hemoglobin level, hematocrit level, platelet count, neutrophil count and the biochemical analysis of alkaline phosphatase (ALP), aspartate aminotransferase (AST), alanine aminotransferase (ALT), creatine kinase (CK), erythrocyte sedimentation rate (ESR), and C-reactive protein (CRP) were recorded.