Men-Bao Qian1, Shang Xia1, Xiao-Nong Zhou2. 1. Key Laboratory on Biology of Parasite and Vector, Ministry of Health, Chinese Center for Disease Control and Prevention, Shanghai 200025, China; National Center for International Research on Tropical Diseases, Chinese Center for Disease Control and Prevention, Shanghai 200025, China; WHO Collaborating Center for Tropical Diseases, Chinese Center for Disease Control and Prevention, Shanghai 200025, China; National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, Shanghai 200025, China. 2. Key Laboratory on Biology of Parasite and Vector, Ministry of Health, Chinese Center for Disease Control and Prevention, Shanghai 200025, China; National Center for International Research on Tropical Diseases, Chinese Center for Disease Control and Prevention, Shanghai 200025, China; WHO Collaborating Center for Tropical Diseases, Chinese Center for Disease Control and Prevention, Shanghai 200025, China; National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, Shanghai 200025, China. Electronic address: ipdzhouxn@sh163.net.