Yunita R., Philosophy Doctor in Medicine Program, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia, Department of Microbiology, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia; Wahyuni A.S., Department of Community Medicine, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia; Sinaga B.Y.M., Department of Pulmonology and Respiratory Medicine, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia; Yamamoto Z., Department of Histology, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia; Soebandrio A., Department of Microbiology, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia; Lia Kusumawati R., Department of Microbiology, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia; Sembiring R.J., Philosophy Doctor in Medicine Program, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia; Pandia P., Department of Pulmonology and Respiratory Medicine, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia