1. Department of Veterinary Medicine; College of Veterinary Medicine; National Chung Hsing University; Taichung Taiwan
2. Department of Veterinary Medicine; College of Agriculture; National Chiayi University; Chiayi City Taiwan
3. Graduate Institute of Microbiology and Public Health; College of Veterinary Medicine; National Chung Hsing University; Taichung Taiwan
4. Graduate Institute of Veterinary Pathology; College of Veterinary Medicine; National Chung Hsing University; Taichung Taiwan