1. Division of Microbiology, Faculty of Medicine, Universitas Swadaya Gunung Jati, Cirebon, Indonesia
2. Department of International Health, Kobe University Graduate School of Health Sciences, 7-10-2, Tomogaoka, Suma-ku, Kobe 654-0142, Japan
3. Research Center for Chemistry, Indonesian Institute of Sciences (LIPI), Kawasan Puspiptek, Serpong 15310, Indonesia
4. Department of Microbiology, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia
5. Department of Oral Vaccine and Drug Development, Kobe University Graduate School of Health Sciences, 1-5-6 Minatojima-minamimachi, Chou-ku, Kobe 650-0047, Japan