1. Department of Infection Control and Laboratory Diagnostics
Tohoku University Graduate School of Medicine
1-1 Seiryo-machi
Aoba-ku, Sendai 980-8574, Japan
2. Department of Microbiology and Infectious Diseases
Toho University School of Medicine
Faculty of Medicine
Tokyo, Japan
3. Department of Microbiology
National Center of Infectious and Parasitic Diseases
Sofia, Bulgaria