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Reports of Lyme Disease in Worcester County, Massachusetts

5,334

Confirmed cases of Lyme disease in Worcester County (2000 to 2020).

Ranked #3 of 14 counties in Massachusetts. That's 10.6% of Massachusetts's 50,332 confirmed cases.

Yearly Breakdown of Lyme Cases in Worcester County

Confirmed cases reported to the CDC each year.
View as a table
Confirmed Lyme disease cases in Worcester County by year
Year Confirmed cases
2000 89
2001 98
2002 204
2003 138
2004 144
2005 233
2006 236
2007 341
2008 585
2009 555
2010 322
2011 177
2012 450
2013 578
2014 604
2015 540
2016 10
2017 13
2018 1
2019 1
2020 15
2000–2020
Confirmed cases
    Worcester County

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    Lyme Stats for Other Massachusetts Counties

    Confirmed Lyme disease cases by county in Massachusetts, 2000 to 2020
    County Confirmed cases Share of state
    Middlesex County 8,465 16.8%
    Plymouth County 6,123 12.2%
    Worcester County 5,334 10.6%
    Norfolk County 5,330 10.6%
    Essex County 4,772 9.5%
    Bristol County 4,314 8.6%
    Barnstable County 3,137 6.2%
    Hampden County 2,264 4.5%
    Berkshire County 1,515 3.0%
    Hampshire County 1,317 2.6%
    Suffolk County 1,184 2.4%
    Dukes County 819 1.6%
    Nantucket County 723 1.4%
    Franklin County 616 1.2%
    Unknown County 4,419 8.8%

    "Unknown County" counts cases the CDC confirmed in Massachusetts without a county of residence. They are included in the state total but not on the map.

    Data Sources

    All Lyme disease prevalence data sourced from the Centers for Disease Control and Prevention's surveillance data. Cases are counted by the patient's county of residence, which may not be where the tick bite occurred.

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