*This research was supported by the 12th Five ?Year Major National Science and Technology Projects of China (No.2011ZX10004 ?001) and Natural Science Foundation of China (31100105). +LIU Zhi Yun, HAO Qin, and HOU Xue Xia contributed equally to this study. #Correspondence should be addressed to: WAN Kang Lin. Tel: 86 ?10 ?58900776. Fax: 86 ?10 ?58900779. E ?mail: wangkanglin@icdc.cn Biographical note of the first authors: LIU Zhi Yun, female, born in 1980, chief examiner; HAO Qin, female, born in 1975, Ph.D, majoring in Lyme disease; HOU Xue Xia, female, born in 1968, associate technician, majoring in Lyme disease. Received: November 15, 2011; Accepted: May 4, 2011