Region | Timeframe | Demographic | Seroprevalence |
Nantucket Island, Massachusetts | August 1975 to July 1976[1] | History of tick bite or fever for ≥3 days | 7.5 percent |
August 1975 to July 1976[1] | Residents and visitors undergoing routine diagnostic | 1.9 percent | |
March 2004[2] | Blood donors | 7.3 percent | |
Martha's Vineyard, Massachusetts | Year-round 2002 to 2007[2] | Blood donors | 1.4 percent |
Cape Cod, Massachusetts | Summer 1984[3] | Blood donors | 3.7 percent |
Block Island, Rhode Island | September 1990 to February 1991[4,5] | Residents | 4.6 percent |
Biannual serosurveys at beginning of summer and in the fall of 1999 and 2000[6] | Residents | 9 percent | |
Connecticut, southeastern | July 1999[7] | Blood donors | 1.9 percent |
September 1999[7] | Blood donors | 0.5 percent | |
Year 2000[6] | Blood donors | 9 percent | |
Summer or year-round, 2000 to 2007[2] | Blood donors | 1.7 percent | |
Connecticut, other than southeastern | Summer or year-round, 2000 to 2007[2] | Blood donors | 0.5 percent |
Shelter Island, New York | June 1978[8] | Residents | 4.4 percent |
October 1978[8] | Residents | 6.9 percent | |
May 1998[9] | Blood donors | 4.3 percent | |
South Fork - Long Island, New York | Fall 1984[9] | Blood donors | 15.8 percent |
Eastern Long Island, New York | Winter 1994 to 1995[10] | Residents | 1 percent |
Minnesota | October to November 2010 and April to November 2011[11] | Blood donors | 2 percent |
July to August 2011[11] | Blood donors | 2.8 percent |
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