The risks described in this figure are relative to each other according to a standard distribution scale. Risk is defined as the probability of finding nymphal ticks positive for Borrelia burgdorferi. For each prevalence quartile, associated climate traits were used to produce a qualitative evaluation of risk according to Office International des Epizooties (OIE) standards at five levels (high, moderate, low, negligible, and null), which directly correlate with the probability of finding nymphal ticks with prevalence in the four quartiles.
EEA standard re-use policy: unless otherwise indicated, re-use of content on the EEA website for commercial or non-commercial purposes is permitted free of charge, provided that the source is acknowledged (http://www.eea.europa.eu/legal/copyright). Copyright holder: European Centre for Disease Prevention and Control (ECDC).