[The biological properties and variants of the Japanese encephalitis virus from a Russian collection]

Analysis of 10 strains and 7 variants of Japanese encephalitis virus from the collection of the D. I. Ivanovskiĭ Institute of Virology of the Russian Academy of Medical Sciences revealed marked differences between the populations in the complex of biological properties (pathogenicity, reproductive potential, antigenic activity, etc.). Of the Japanese encephalitis virus variants included in the collection attenuated clones 33 and 43 are practically the most interesting as potential candidates for diagnostic and prophylactic preparations.