Abstract
1 National Institute of Animal Health, Kaset Klang, Chatuchak, Bangkok 10900, Thailand
2 Lampang Hospital, Muang, Lampang 52000, Thailand
3 Fifth Bureau of Animal Hygiene and Sanitation, Huaykaew, Chiangmai 50300, Thailand
4 Department of Veterinary Pathobiology, University of Missouri, Columbia, MO 65211, USA
5 Department of Parasitology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand