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Correspondence: Ning Xiao, Institute of Parasitic Diseases, Sichuan Center for Disease Control and Prevention, Chengdu, Sichuan 610041, PR China; Email: ningxiao116@yahoo.com.cn.
Author Contributions: NX, JR, PB and DB conceived of and designed the study, and were assisted by DQ and RS who coordinated the study.
NX and YL carried out the molecular genetic studies, and were assisted by JR, PB and DB in analysing the results.
NX, JR, PB and DB drafted the manuscript.
All authors read and approved the final manuscript.
Acknowledgments: The authors wish to thank Kang Junxing, Director of the Sichuan Center for Disease Control and Prevention (Chengdu, People's Republic of China) for his continued support and collaboration.
The authors also wish to acknowledge Zhong Bo, Ye Hong, Cui Lina, Chen Lin, Zhang Yi, Meng Xianhong of the Sichuan Center for Disease Control and Prevention for their contribution to the laboratory work.
Disclosures: The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
The authors declare that they have no competing interests.
This work was supported in part by the NIH/NSF Ecology of Infectious Disease Program (grant no. 0622743) and the Emory Global Health Institute.
© 2011 Xiao et al; licensee BioMed Central Ltd.