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Geographic Distribution of Ticks in the United States - CDC Maps 2012
  Tick distribution: Borrelia burgdorferi has been found in
 Ixodes pacificus ticks in 42 California counties*
   Physicians should be aware that people
 can be exposed to Lyme disease carrying
   ticks in many regions of California

Source: - California Department of Public Health

California Tick Distribution Map In Copyright since 2000