U.S. Maps and Statistics
Lyme Disease Risk
Risk Classification:
High Risk: High density of host-seeking nymphal I.scapularis ticks.
Medium Risk: Medium density of host-seeking nymphal I.scapularis ticks
or where at least 2% of I. pacificus ticks have been shown to be
infected with B. burgdorferi.
Low Risk: Areas where I. scapularis or I. pacificus ticks
have been reported, but host-seeking nymphs are extremely rare (I. scapularis)
or infection prevalence is low (I. pacificus).
No Risk: No reports of I. scapularis or I. pacificus ticks.
Data Sources:
Diuk-Wasser, M.A., Gatewood, A.G., et al., 2006. (Click here for
abstract.)
CDC MMWR Supplement (ref) (Click here for
document)
California Department of Health Services, Vector-Borne Disease Section (Click here for
document).
Reported Cases of Lyme Disease -- United States, 2004

Source
CDC Division of Vector-Borne Infectious Diseases.
Number of Reported Cases of Lyme Disease per State, 1993-2007
Footnote: These data are provided by the Centers for Disease Control and Prevention from annual morbidity and mortality reports.