1. Department of Chemical Biology MOE Key Laboratory of Spectrochemical Analysis & Instrumentation Key Laboratory for Chemical Biology of Fujian Province College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China
2. National Research Center of Engineering and Technology for Veterinary Biologicals Jiangsu Academy of Agricultural Sciences Nanjing 210014 P. R. China
3. Jiangsu Co-innovation Center for the Prevention and Control of Important Animal Infectious Diseases and Zoonoses Yangzhou 225009 P. R. China