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An analysis of joint occurrence of tick-borne encephalitis and
Lyme borreliosis in the Central Bohemian region of Czechoslovakia, based on clinical cases, showed a divergency in the dispersion patterns of the diseases. Whilst tick-borne encephalitis infections occurred in a few limited areas and its clinical cases tended to aggregate into well defined clusters, apparently following its natural focality, the cases of
Lyme borreliosis were scattered +/- randomly over nearly all the region without forming such marked clusters and having little topographical correlation with tick-borne encephalitis. A computer model was applied to substantiate the observations.