[Isolation and identification of Japanese encephalitis virus in Tanghe County, Henan Province].
OBJECTIVE
To isolate Japanese encephalitis virus (JEV) from mosquitoes collected in Tanghe County, Henan province and analyze the genotype of the newly isolated JEV strains and the characteristics of amino acid in the E gene.


METHODS
Viruses were isolated from mosquitoes collected in 2004 and identified by biological, serological and molecular biologic methods. PrM and E segments of the newly isolated JEV were amplified by RT-PCR, the PCR products were purified and sequenced. Multiple alignment, phylogenetic and amino acid (AA) analysis were carried out by Clustal X (1.8) program, MEGA 3.1 and GENEDOS (3.2).


RESULTS
Totally 3722 mosquitoes were collected including Culex, Armigeres, Aedes, Anopheline. Three new JEV strains isolated from Culex belonged to genotype 1. The homologue of nucleotide and amino acid of E gene between new JEV strains and live attenuated vaccine strain SA14-14-2 was 86.9-87.7% and 95.2%-97.0%, respectively. Totally there were 12 common sites of amino acid differences in E gene between them.


CONCLUSIONS
Newly isolated viruses in Henan province belonged to JEV genotype 1. It suggests that the vaccine strain SA14-14-2 currently used for preventing JE is able to protect people from JEV infection, although there are some amino acid differences between them.
Wang
Huan-yu
HY
Department of Viral Encephalitis, Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China.
Hao
Zong-yu
ZY
Fu
Shi-hong
SH
Zhang
Ai-mei
AM
Cao
Yu-xi
YX
Song
Fu-dang
FD
Li
Lin-hong
LH
He
Ying
Y
Wang
Huan-qin
HQ
Tang
Qing
Q
Liang
Guo-dong
GD
D000818:Animals; D000831:Animals, Newborn; D002460:Cell Line; D002681:China; D009033:Culicidae / Q000821:virology*; D004664:Encephalitis Virus, Japanese / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D004672:Encephalitis, Japanese / Q000097:blood / Q000821:virology; D005838:Genotype; D007303:Insect Vectors / Q000821:virology*; D051379:Mice; D010802:Phylogeny; D012367:RNA, Viral / Q000235:genetics / Q000302:isolation & purification; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid
D012367:RNA, Viral