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AbstractFrom July to September in 2005 and 2006, a survey was conducted to identify mosquito species and mosquito-borne arboviruses at elevations ranging from 900–3280 m between 24°00’ N and 29°00’ N latitude in the northwestern part of Yunnan Province, China. A total of 54,879 mosquitoes representing 15 species and 4 genera was collected using UV light traps at 59 sites. Culex tritaeniorhynchusand Anopheles sinensiswere the most abundant species. The density of mosquitoes as well as the diversity of species decreased with increasing altitude. A total of 21,008 mosquitoes in 281 pools representing all of the 15 species was tested for the presence of viruses using cell culture. Viruses identified included Japanese encephalitis virus (13 isolates), Getah virus (five isolates), Banna virus (three isolates), Kadipiro virus (five isolates), and Densovirus (seven isolates). These isolates were obtained from Culex tritaeniorhynchus(20 isolates), Anopheles sinensis(three isolates), Armigeres subalbatus(six isolates), Culex pipiens quinquefasciatus(two isolates), and from unidentified, mixed mosquitoes (two isolates). Most of the isolates were from collections made at elevations below 2,500 m.Vector Borne Zoonotic Dis. 0, 000–000. [ABSTRACT FROM AUTHOR]

Genome sequencing and virulence studies of 2 Japanese encephalitis viruses (JEVs) from bats in Yunnan, China, showed a close relationship with JEVs isolated from mosquitoes and humans in the same region over 2 decades. These results indicate that bats may play a role in human Japanese encephalitis outbreaks in this region. [ABSTRACT FROM AUTHOR]

We recently determined that Nanjianyin virus, isolated from serum of a patient in Yunnan Province, China, in 1989, is a type of Kyasanur Forest disease virus. Results of a 1987-1990 seroepidemiologic investigation in Yunnan Province had shown that residents of the Hengduan Mountain region of had been infected with Nanjianyin virus. [ABSTRACT FROM AUTHOR]