*This research was supported by grants from the National Natural Science Foundation of China (30970165 and 81102230), Hunan Provincial Natural Science Foundation of China (09JJ3059) and Team Project for the Technology Innovation of Higher Education of Hunan province, China, 2010. △LI Zhong Yu and HUANG Qiu Lin contributed equally to this work. #Correspondence should be addressed to WU Yi Mou, Tel: 86 ?734 ?8282907. E ?mail: lzhy1023@hotmail.com Biographical note of the first authors: LI Zhong Yu, female, born in 1972, Professor and Ph.D, majoring in pathogenesis and diagnosis of C. trachomatis; HUANG Qiu Lin, male, born in 1973, Chief Physician and Ph.D, majoring in pathogenesis of hepatocellular carcinoma. Received: December 28, 2011; Accepted: December 18, 2012