[Study on the phenotypic characteristics of Japanese encephalitis virus strains isolated from different years].
In order to reveal the phenotypic characteristics of 17 JE virus strains isolated from different years, plaque sizes, mice neurovirulence and mice neuroinvasiveness of the isolates were studied and compared. BHK21 cell monolayers were used for testing the plaque sizes. The virus neurovirulence was tested in 9-11g mice inoculated intracerebrally and the virus neuroinvasiveness was tested in 9-11g and 14-16g by subcutaneous inoculation. Results showed that all the viruses produced clear plaques on the BHK21 cell monolayers with different sizes and all the virus strains appeared high neurovirulence in the mice with higher than lg8. 0/0.03 mL virus titers, while no apparent difference among them. The neuroinvasiveness (subcutaneous virulence) tested in the 9-11g mice had shown a little difference, but when tested in the 12-14 g mice,the difference was apparent. The results demonstrated that JEV in nature were highly neurovirulent with no apparent difference. However the neuroinvasiveness of the JEV in nature was greatly different, which didn't relate to the years of isolation and genotypes, but most of the viruses isolated from patients showed higher neuroinvasiveness.
Liu
Xin-Yü
XY
National Institute for the Control of Pharmaceutical and Biological Products, Beijing 100050, China.
Yu
Yong-Xin
YX
Li
Mao-Guang
MG
Xu
Hong-Shan
HS
Wang
Huan-Yü
HY
Liang
Guo-Dong
GD
Jia
Li-Li
LL
Dong
Guan-Mu
GM
D000818:Animals; D002460:Cell Line; D002681:China; D009033:Culicidae / Q000821:virology; D004664:Encephalitis Virus, Japanese / Q000235:genetics / Q000302:isolation & purification* / Q000472:pathogenicity*; D004672:Encephalitis, Japanese / Q000821:virology*; D005838:Genotype; D006801:Humans; D051379:Mice; D010641:Phenotype; D010948:Viral Plaque Assay; D014774:Virulence