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[Explantation method of isolating a persistent tick-borne encephalitis virus from the organs of infected monkeys].

The method of explantation was used to examine 63 organs from M. rhesus monkeys 92-783 days after intracerebral and subcutaneous inoculation with the Vasilchenko, Aina/1448 and 41/65 strains of tick-borne encephalitis virus. The optimal time for examination of the explants by tests of the hemagglutinating, cytopathogenic activity of the virus and its pathogenicity for mice was found to be the 15th day of cultivation. A comparative study of the properties of 3 isolates obtained from explants of the spleen, liver and subcortical cerebral ganglia 202 and 307 days after inoculation of monkeys was carried out. The isolates differed from the parental TBE virus strains by their capacity to form small plaques in PEKV cell cultures (pig embryo kidney cells in versen medium).