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Japanese b encephalitis virus

a virus of the genus flavivirus (group B arbovirus) occurring particularly in japan but probably widespread throughout Southeast Asia; the virus is normally present in humans, especially in children, as an inapparent infection, but may cause febrile response and sometimes encephalitis; it may cause encephalitis in horses and abortion in pigs; wild birds are probably the natural hosts and culicine mosquitoes the vectors.

Synonym: Russian autumn encephalitis virus.