593232.fig.001a
(a)
593232.fig.001b
(b)
Figure 1: Changes in tick distribution in northern and central Sweden. White dots illustrate districts in Sweden where ticks were reported to be present before 1980 (a) and in 1994-1995 (b). The study region is within the black line (Lindgren et al. 2000, [12] with permission from Environmental Health Perspectives).