Ming Liu, Xiaodan Chen, Yue Wang, Yun Zhang*, Yongfeng Li, Yunfeng Wang, Nan Shen and Hualan Chen*
* Corresponding authors: Yun Zhang yunzhang03@yahoo.com - Hualan Chen hlchen1@yahoo.com
Virology Journal 2010, 7:133 doi:10.1186/1743-422X-7-133