1. Center for Emerging Infectious Diseases1 and Department of Bacterial Infections2, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka 565-0871, Japan 3Kansai Airport Quarantine Station, 1 Senshu Kuko Naka, Tajiri-cho, Sennan-gun 549-0011, Japan