Nonsuppurative Encephalomyelitis in a Calf in Japan and Isolation of Japanese Encephalitis Virus Genotype 1 from the Affected Calf

Japanese encephalitis virus (JEV) was isolated from the cerebrum of a calf which showed severe neurological symptoms in late September 2009, and the JEV isolate was revealed to be of genotype 1. This is the first report describing the isolation of genotype 1 JEV from cattle.