Figure 1.
Map, showing the four regions where the 34 primary health care centers (PHCs) are located.
Southernmost Sweden (10 PHCs), South Central Sweden (20 PHCs), Northern Sweden (3 PHCs), and Åland Islands (1 PHCs). SE: Sweden, FI: Finland.
Figure 2.
Distribution of Borrelia species in nymphs (N) and adults (A).
The percentage of positive ticks per typeable species is given. The numbers of infected ticks examined are indicated above the bars. Abbreviations: B. a, B. afzelii; B. g, B. garinii; B. v, B. valaisiana; B. b, B. burgdorferi sensu stricto; B. m, B. miyamotoi; B. s, B. spielmanii; B. l, B. lusitaniae.
Figure 3.
Borrelia species plotted against the number of Borrelia cells per tick.
Horizontal lines indicate the median, with upper and lower quartiles. *, p < 0.05; **, p < 0.01; ***, p < 0.001. Abbreviations: B. a, B. afzelii; B. g, B. garinii; B. v, B. valaisiana; B. b, B. burgdorferi sensu stricto; B. m, B. miyamotoi; B. s, B. spielmanii; B. l, B. lusitaniae.
Figure 4.
Tick feeding-time (hours) plotted against the number of Borrelia cells in A. adult female ticks, and B. nymphal ticks.
Horizontal lines indicate the median, with upper and lower quartiles. *, p < 0.05.
Figure 5.
Tick feeding-time (hours) plotted against the number of Borrelia cells in ticks of different stages.
Adult female ticks and nymphs infected with B. afzelii or B. garinii. Horizontal lines indicate the median, with upper and lower quartiles. *, p < 0.05; ***, p < 0.001.