1 Department of Farm Resources and Production Medicine, Faculty of Veterinary Medicine, Kasetsart University, Kamphaeng Saen, Nakhon Pathom, Thailand.
2 Department of Infectious Diseases and Veterinary Public Health, Faculty of Animal Sciences and Veterinary Medicine, Nonglam University, HCMC, Vietnam.
3 Department of Pathology, Faculty of Veterinary Science, Chulalongkorn University, Pathum Wan, Bangkok, Thailand.