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Geographic Distribution of Ticks in the United States - CDC Maps 2012

Human case distribution: human risk of exposure to
 potentially infected Ixodes pacificus nymphs can be highly focal.
Map Legend
Map A - County level human Lyme Disease risk based on human incidence data only
Dark Gray - High Risk
Light Gray
- Medium Risk
White - Low to No Risk

Map B - Focal (zip code) level human Lyme Disease exposure potential based on human incidence and nymphal tick habitat
Dark and Light Gray - California counties and zip codes with high and medium Lyme Disease incidence
Red - High projected risk of exposure to Ixodes pacificus nymphs

California County Level Human Lyme Risk Maps In Copyright since 2000