Monthly distributions of cases of TBE and monthly densities of ticks. a) Bern, Switzerland, b) Bavaria, SE Germany, c) Slovenia, d) Brno-mesto, SE Czechland. Upper and middle histograms for each country: means (± 1 st dev) over 2000–04 (grey), 2005 (green), 2006 (black) and 2007 (gold). In a) TBE case numbers for all Switzerland for 2000–04 (mean annual total 101) and for 2006 (total 259) are shown as pale grey bars and on the right-hand y-axis, behind the data for Bern; in d) TBE case numbers for all Czechland for 2000–04 (mean annual total 623) and for 2006 (total 1029) are shown in the same way. Lower histogram for each country, mean (± 1 st dev) monthly densities of ticks at 4–7 sampling sites matched to the above TBE incidence areas (locations given in Table 2) over 2005 (green), 2006 (black) and 2007 (gold). The tick data are advanced by one month in relation to the TBE data, to account for the approximate delay between tick bite and TBE registration. Annual total numbers of TBE cases and counted ticks for each year are shown.