Yasmon, A., Department of Microbiology, Faculty of Medicine, University of Indonesia, Jakarta, Indonesia; Fatmawati, N.N.D., Department of Microbiology, Faculty of Medicine, University of Udayana, Bali, Indonesia; Ibrahim, F., Department of Microbiology, Faculty of Medicine, University of Indonesia, Jakarta, Indonesia; Bela, B., Department of Microbiology, Faculty of Medicine, University of Indonesia, Jakarta, Indonesia