1. Division of Bacterial Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China,
2. Tianjin Animal Science and Veterinary Research Institute, Tianjin, China,
3. College of Wildlife Resources, College of Life Science, Northeast Forestry University, Harbin, PR China, and
4. College of Pharmacy, The University of Texas at Austin, Austin, TX, USA