1. Department of Bacteriology; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
2. Department of Microbiology and Medical Zoology; Aichi Prefectural Institute of Public Health; Nagoya Japan
3. Department of Microbiology; Nagoya City University Hospital; Nagoya Japan
4. Department of Infection Control and Prevention Nursing; Nagoya City University Graduate School of Nursing; Nagoya Japan