1. Department of Veterinary Public Health and Pharmacology, Faculty of Veterinary Medicine and Animal Science, University of Peradeniya, Peradeniya, Sri Lanka.
2. Division of Bacteriology, Veterinary Research Institute, Gannoruwa, Peradeniya, Sri Lanka.
3. Government Veterinary Hospital, Peradeniya, Sri Lanka.
4. Department of Bacteriology I, National Institute of Infectious Diseases, Tokyo, Japan.
5. Department of Microbiology, Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka.