1. Division of Infection Control and Disease Prevention, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
2. Department of Veterinary Pathology, Faculty of Veterinary Medicine, Vietnam National University of Agriculture, Hanoi, Vietnam
3. Faculty of Animal Science and Veterinary, University of Agriculture and Forestry, Hue University, Hue, Vietnam
4. Laboratory of OSG Veterinary Science for Global Disease Management, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
5. Faculty of Veterinary Medicine, Okayama University of Science, Ehime, Japan