Correlation-plot showing the pathogen combinations observed in urban I. ricinus ticks in Switzerland. The more frequent a pathogen combination, the bigger the respective circle in the plot. In addition, the absolute counts of ticks with the particular pathogen combination are given in numbers. Abbreviations: B.g., B. garinii; B.a., B. afzelii; B.b.(s.s.), B. burgdorferi (sensu stricto); B.va., B. valaisiana; B.m., B. miyamotoi; R.h., R. helvetica; R.m., R. monacensis; A.p., A. phagocytophilum; B.ve., B. venatorum (Babesia sp., EU1); N.m., "Candidatus N. mikurensis"; B.b.(s.l.), two (or more) different B. burgdorferi (sensu lato) species, not distinguishable. Other combinations of three different pathogens are not shown in this plot; these were 1× B. afzelii + R. helvetica + A. phagocytophilum and 1× B. afzelii + B. venatorum (Babesia sp., EU1) + "Ca. N. mikurensis"