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The dextran sulphate (DS) marker was studied in 25 large plaque forming strains of tick-borne encephalitis virus freshly isolated from ticks of different species as well as from patients in Western Siberia, Baltic republics of the U.S.S.R. and Yugoslavia. The strMns isolated in close geographical areas in the Baltic republics but from different tick species (1. persulcatus and I. ricinus) had different DS characteristics, whereas the strains isolated in remote geographical areas as Western Siberia and the Baltic republics, but originating from the same tick species (I. persulcatus) were found to have the same DS marker. These findings suggest that the DS marker in tick-borne encephalitis virus might be associated not with the geographic origin of the strains, but with species of ticks from which the isolates were obtained.Arch. ges. Virusforsch. 45/3 14