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Prevalence of B. burgdorferi sensu lato in I. ricinus ticks in defined regions of Europe. Each dot represents a single entry (locality). The middle lines represent the means; error bars, standard errors of the means. Results were compared by ANOVA, followed by Bonferroni's multiple-comparison test. *, P < 0.05; **, P < 0.01; ***, P < 0.001. (A) Comparison of all ticks; (B) comparison of nymphal I. ricinus ticks.
