Fig. 1

a The study area covers 8 districts in northern Norway (from 64°56'N–68°48'N) across the Arctic Circle (66°33'N). The Vesterålen and Lofoten archipelago (hatched area, left) and Narvik city (hatched area, right) were not included in the study. b Scatter diagram of the origin of ticks in the study area (red dot = one single tick). In the southernmost district (Brønnøy) 244 ticks were collected, and in the northernmost district (Harstad) 6 ticks. c Sketch map showing the study area in relation to western Europe. Copyright: Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by-nc-nd/4.0/deed.no). Citation: Hvidsten et al. (2014) Ixodes ricinus and Borrelia prevalence at the Arctic Circle in Norway. Ticks Tick Borne Diseases. 2014;5:107–12 [14]