Monthly abundances of I. ricinus and Borrelia burgdorferi s.l. prevalences at three study sites in the Siebengebirge in 2007 and 2008. From May to September 2007 and 2008, host-seeking I. ricinus were collected by blanket dragging at three plant communities (Galio-Fagetum typicum, Fraxino-Aceretum pseudoplatani and Luzulo-Fagetum milietosum) in the nature reserve Siebengebirge, and the ticks were examined for Borrelia infection. The monthly abundances of ticks (columns) and Borrelia burgdorferi s.l. prevalences (line diagram) in 2007 (black squares) and 2008 (white squares) at the three study sites are presented in the figure.