Wu-Ping Peng1, Qiang Hou1, Zhao-He Xia1, Dan Chen1, Na Li1, Yuan Sun1, Hua-Ji Qiu1
1Division of Swine Infectious Diseases, National Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, 427 Maduan Street, Harbin 150001, Heilongjiang, China