1. Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, Taichung, Taiwan
2. Veterinary Medical Teaching Hospital, College of Veterinary Medicine, National Chung Hsing University, Taichung, Taiwan
3. Department of Veterinary Medicine, National Chiayi University, Chiayi City, Taiwan
4. Graduate Institute of Microbiology and Public Health, National Chung Hsing University, Taichung, Taiwan