1. Department of Gastroenterological and Pediatric Surgery, Oita University Faculty of Medicine, 1-1 Idaigaoka, Hasamamachi, Yufu City 879-5593, Oita, Japan
2. Laboratory of Veterinary Public Health, Department of Veterinary Sciences, Faculty of Agriculture, University of Miyazaki, 1-1 Gakuenkibanadai-Nishi, Miyazaki City 889-2192, Miyazaki, Japan
3. Department of Microbiology, Oita University Faculty of Medicine, 1-1 Idaigaoka, Hasamamachi, Yufu City 879-5593, Oita, Japan
4. Research Center for GLOBAL and LOCAL Infectious Diseases, Oita University, 1-1 Idaigaoka, Hasamamachi, Yufu City 879-5593, Oita, Japan
5. Department of Virology, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita City 565-0871, Osaka, Japan