[The biological characteristic of the collection strains of viruses from the subgroup of Japanese encephalitis].

Perennial (since 1966) study of the biological properties of the viruses from the flavivirus subgroups of the Japanese encephalitis (JE) made it possible to collect and deposit in the State collection of JE virus strains JE virus strains isolated from natural foci in different geographic zones, as well as the JE virus strains selected in the laboratory. The collection of the flaviviruses strains of Japanese encephalitis complex, West Nile fever (West Nile virus and Usutu), which were studied and preserved, are listed. The data are provided on the origin of strains and their pathogenicity for laboratory animals.