国家重点感染性疾病项目No .2013ZX10004-101;中国疾病预防控制中心国家重点实验室项目No .2014SKLID104;长治医学院科技创新团队支持项目CX201412资助@@@@Financially supported by the Project of the National Key Program of Mega Infectious Diseases.2013ZX10004-101;the Key Project of the State Key Laboratory for Infectious Disease Prevention and Control.2014SKLID104;a Science and Technology Innovation Team Support Project No .CX201412 from Changzhi Medical College