1. Department of Pathogen Biology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China
2. College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, P. R. China
3. School of Pharmaceutical Sciences, Key laboratory of Targeting Therapy and Diagnosis for Critical Diseases, Zhengzhou University, Zhengzhou 450001, P. R. China
4. College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, P. R. China
5. Center of Disease Control and Prevention of Henan Province, Zhengzhou 450016, P. R. China