1. Department of Microbiology; Kobe University School of Medicine; Kobe Hyogo 650
2. International Center for Medical Research; Kobe University School of Medicine; Kobe Hyogo 650
3. Department of Microbiology, Faculty of Medicine; University of Indonesia; Jakarta 10490 Indonesia
4. Department of Medical Zoology; Kobe University School of Medicine; Kobe Hyogo 650
5. Department of Parasitology; Hiroshima University School of Medicine; Hiroshima Hiroshima 734