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Table 3 Field sites sampled and the Simpson's index of diversity for identified genotypes

From: Not “out of Nantucket”: Babesia microti in southern New England comprises at least two major populations

  Samples Collection years No. types Diversity No. with multiple types
Established sites of transmission    
Martha's Vineyard 92 1999-2013 79 0.98 [0.97, 0.98] 19 (21%)
Nantucket 127 1986-2013 52 0.89 [0.85, 0.93] 30 (24%)
Great Island 58 1986, 1993 10 0.51 [0.37, 0.63] 17 (29%)
Sandy Neck 4 1988 4 nd 1 (25%)
Ipswich 10 1999, 2010 9 0.86 [0.79, 88] 5 (50%)
Block Island 11 1997-1998 8 0.80 [0.56, 0.85] 3 (27%)
Prudence Island 35 1998-2000 19 0.90 [0.84, 0.92] 8 (30%)
Connecticut 11 1997-2014 11 0.90 [0.78, 0.90] 2 (18%)
Mainland Rhode Island 4 2003 3 nd 0
Emerging sites of transmission    
Grafton 11 2008-2014 7 0.76 [0.51, 0.83] 5 (45%)
Dover 16 2012-2013 8 0.71 [0.53, 0.83] 2 (13)
Total 387   190 0.97 [0.96, 0.98]