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In 1986-88, the highest levels of humoral immunity (50-90%) to California serogroup viruses were found in humans in northern Eurasia in the zone of coniferous forests. In the central regions of European Russia, in the zone of mixed and deciduous forests, the frequency of positive findings was about ...

Butenko, A. M.; Galkina, I. V.; Kuznetsov, A. A.; Kolobukhina, L. V.; Lvov, S. D.; Nedyalkova, M. S.
Springer-Verlag, Wien, Austria
Archives of Virology, Supplementum, 1990, No. 1, pp 235-241