1. Department of Microbiology and Immunology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan.
2. Graduate School of Infectious Diseases, Hokkaido University, Sapporo, Japan.
3. Department of Microbiology and Immunology, Faculty of Medicine, Hokkaido University, Sapporo, Japan.
4. School of Medicine, Hokkaido University, Sapporo, Japan.
5. Department of Microbiology, Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka.
6. Girandurukotte Veterinary Office, Girandurukotte, Sri Lanka.