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