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Table 1 Areas in The Netherlands in 2000 – 2008 categorized according to three levels of probable tick densities

From: Circumstantial evidence for an increase in the total number and activity of borrelia-infected ixodes ricinus in the Netherlands

Density 2000 2004 2008 Change 2000-2008
High    4399 km2    4483 km2    5246 km2 19%
Low 15608 km2 15517 km2 15645 km2 1%
Zero 13744 km2 13755 km2 12652 km2 −8%