A total of 54,673 mosquitoes were collected at 11 sites located near the 
China-Myanmar border in the western part of Yunnan Province during July and 
August 2007. There were 29 species in 4 genera identified from the collections, 
including 12 species of Culex, 12 species of Anopheles, 3 species of Aedes, and 
2 species of Armigeres. Culex tritaeniorhynchus Giles (67.9%, 37,119/54,673) and 
Anopheles sinensis Wiedemann (25.9%, 14,170/54,673) were the most abundant 
species in this investigation. Virus was isolated using BHK-21 and C6/36 cells 
from 22 of 510 mosquito pools. Isolates included Japanese encephalitis virus 
(JEV) and Getah virus (GETV), which were identified by serological and molecular 
methods. Twenty JEV strains were isolated from Cx. tritaeniorhynchus (15 
isolates), An. sinensis (3 isolates), and Armigeres subalbatus Coquillett (2 
isolates), and 2 GETV strains were isolated from Culex pseudovishnui Colless and 
Cx. tritaeniorhynchus. This study suggests that Ar. subalbatus is a potentially 
important local vector because of the high JEV infection ratio found in this 
species. Enzootic JEV transmission persists in this area and therefore, 
surveillance for human disease caused by JEV and GETV should be conducted in the 
region.