1. Department of Veterinary Science, National Institute of Infectious Diseases, Japan
2. Research Center for Biosafety, Laboratory Animal and Pathogen Bank, National Institute of Infectious Diseases, Japan
3. Department of Bacteriology I, National Institute of Infectious Diseases, Japan
4. Tokyo Pest Control Association, Japan
5. Laboratory of Veterinary Ethology, The University of Tokyo, Japan
6. School of Life and Environmental Science, Azabu University, Japan