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Volume 21, Number 8—August 2015
Dispatch

Geographic Distribution and Expansion of Human Lyme Disease, United States

Kiersten J. KugelerComments to Author , Grace M. Farley, Joseph D. Forrester, and Paul S. Mead
Author affiliations: Centers for Disease Control and Prevention, Fort Collins, Colorado, USA

Main Article

Table

Data for United States counties with high incidence of human Lyme disease during four 5-year periods, 1993–2012*

Location, period No. counties Relative risk, range† Average annual incidence, range‡ No. counties added to high-incidence status No. counties removed from high- incidence status
Overall
1993–1997 69 2.3–91.1 10.6–402.7 NA NA
1998–2002 130 2.0–152.6 12.3–912.9 71 10
2003–2007 197 2.0–101.3 15.0–742.8 72 5
2008–2012
 260
 2.0–48.6
 15.9–381.4
 72
 9
Northeastern focus
1993–1997 43 2.3–91.1 10.6–402.7 NA NA
1998–2002 90 2.0–152.6 12.3–912.9 50 3
2003–2007 130 2.0–101.3 15.0–742.8 45 5
2008–2012
 182
 2.0–48.6
 15.9–381.4
 60
 8
North-central focus
1993–1997 22 2.6–41.3 12.1–189.6 NA NA
1998–2002 40 2.0–35.3 12.4–217.3 21 3
2003–2007 67 2.0–29.8 15.0–222.7 27 0
2008–2012 78 2.1–28.1 16.1–220.7 12 1

*In the first period, 4 counties in the southeastern United States met high-incidence criteria but are not included in the geographic focus–specific data. NA, not applicable.
†Relative risk is observed number of cases over a period divided by expected number of cases for the population at risk (4). For this analysis, high-incidence counties had a relative risk of >2.0.
‡Incidence is reported cases per 100,000 residents per year; population used was average population at risk during a period (US census data for midpoint of each period).

Main Article

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Page updated: May 11, 2016
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The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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