Figure. . Correlation between the seroprevalence of Francisella tularensis in the European brown hare (Lepus europaeus) population, the population density of European brown hares and common voles (Microtus arvalis), and the number of tularemia cases in humans eastern Hungary, 1984–2010. Values were determined on the basis of biological years (March–February). Median values from the records of 3 counties were used for analysis.