1. Department of Medical Microbiology; School of Medicine; Nanchang University; Nanchang China
2. Institute of Preventive Veterinary Medicine; Sichuan Agricultural University; Chengdu China
3. Department of Pharmaceutical Sciences; Eugene Applebaum College of Pharmacy/Health Sciences; Wayne State University; Detroit Michigan USA
4. College of Animal Science and Technology; Southwest University; Chongqing China