SHI Qiao-fa, WEI Xiao-li, LI Hong, WANG Bao-ning, ZHANG Wei-dong, JIANG Zhong-hua, CAO Kang, LI Ming-yuan Department of Microbiology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu 610041, China; Department of Immunology, Xinjiang Medical University, Urumchi 830054, China; Department of Microbiology, Chengdu Medical College, Chengdu 610083, China