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An investigation was conducted to identify the distribution of mosquitoes and mosquito-borne arboviruses in the Qinghai-Tibet Plateau, China from July to August in 2007. A total of 8,147 mosquitoes representing six species from three genera (Aedes, Culex, and Anopheles) were collected in three locations (Geermu city, altitude of 2,780 m; Xining city, 2,200 m; Minhe county, 1,700 m). Six virus isolates were obtained including Tahyna virus (TAHV), Liaoning virus, and Culex pipiens pallens Densovirus. A serosurvey showed immunoglobulin G antibodies by immunofluorescence assay (IFA) against TAHV in residents of all three locations. The IFA-positive human samples were confirmed by 90% plaque-reduction neutralization tests (PRNT90) against TAHV with titers ranging from 1:20 to 1:10,240. In addition, TAHV seropositive cows, sheep, and swine were found in these locations. This investigation represents the first isolation of TAHV from Ae. (Och.) detritus and the first evidence of TAHV infection in residents and livestock in the Qinghai-Tibet Plateau.
Financial support: This work was supported by Grant 2003BA712A08-01 from the Ministry of Science and Technology of China, Grant 2008SKLID105 from the Development Grant of State Key Laboratory for Infectious Disease Prevention and Control, and Grant U19-GH000004 from the China CDC–United States CDC Cooperative Agreement.
Authors' addresses: Wen-Juan Li, Jing-Lin Wang, Ming-Hua Li, Shi-Hong Fu, Huan-Yu Wang, Qing Tang, and Guo-Dong Liang, State Key Laboratory for Infectious Disease Prevention and Control, Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China, E-mails: firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, and firstname.lastname@example.org. Wen-Juan Li and Zhi-Yu Wang, Department of Virology, School of Public Health, Shandong University, The Key Laboratory of Experimental Teratology, Ministry of Education, China, E-mails: email@example.com and Zhiyu.firstname.lastname@example.org. Shuang-Ying Jiang, Xue-Wen Wang, Peng Guo, Sheng-Cang Zhao, Yan Shi, and Nan-Nan Lu, Health Inspection and Testing Center, Qinghai Center for Disease Control and Prevention, China, E-mails: ShuangYing_Jiang@163.com, XueWen_Wang_qh@163.com, Peng_Guo_qh@163.com, Shengcang_zhao@163.com, email@example.com, and firstname.lastname@example.org. Roger S. Nasci, Division of Vector-Borne Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins, CO, E-mail: email@example.com.
Reprint requests: Guo-Dong Liang, State Key Laboratory for Infectious Disease Prevention and Control, Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, 100# Yingxin Street, Xuanwu District, Beijing 100052, China, E-mail: firstname.lastname@example.org.