Changtai Zhu, Jinming Liu, Yang Ling, Hua Yang, Zhonghua Liu, Ruijuan Zheng, Lianhua Qin* and Zhongyi Hu*
* Corresponding authors: Lianhua Qin qlh1013@yahoo.com.cn - Zhongyi Hu shtblab@163.com
BMC Infectious Diseases 2012, 12:96 doi:10.1186/1471-2334-12-96