Japanese encephalitisBVirus (encephalitisBVirus) is a member of the arborvirusB group, belonging to the genus flavivirus of the family Draboviridae. The antigenicity of JE virus is relatively stable, both humans and animals are susceptible, and can produce complement binding antibodies, hemagglutination inhibiting antibodies and neutralizing antibodies after infection. In particular, specific IgM antibodies can appear in the blood on the fourth day after infection, and peak at 2 to 3 weeks. Therefore, the detection of specific IgM antibodies helps in early diagnosis. Japanese encephalitis virus for short Japanese encephalitis virus. Pathogens of epidemic Japanese encephalitis. Spherical, nucleic acid is single-stranded RNA, outer envelope, envelope surface with hemagglutinin. Under low temperature conditions, it can multiply from bottom to bottom for a long time in animal, chicken embryo and tissue culture cells. Young pigs are the main source and intermediate host of JE virus, and mosquitoes are the vectors of JE virus transmission. When a person is bitten by a mosquito carrying the virus, JE virus enters the human body, proliferates in phagocytic cells such as vascular endothelial cells, lymph nodes, liver and spleen, and reaches the brain through blood circulation, causing inflammation.