Surveillance phase | Year | No. area surveyed (ha) | No. area with infested snails (ha) | No. area of new snail habitat(ha) | No. area with infected snails(ha) | No. frames surveyed | No. frames with snails | No. dissected living snails | No. infected snails | Percentage of frames with living snails, % (95% CI) | Infection rate, % (95% CI) |
---|---|---|---|---|---|---|---|---|---|---|---|
I | 2005 | 6966 | 5150 | 13 | 482 | 335 391 | 56 884 | 256 531 | 663 | 16.96 (16.83–17.09) | 0.2584 (0.2388–0.2781) |
2006 | 7462 | 5014 | 22 | 625 | 374 149 | 47 808 | 203 828 | 744 | 12.78 (12.67–12.88) | 0.3650 (0.3388–0.3912) | |
2007 | 7110 | 4603 | 1 | 244 | 356 623 | 41 927 | 152 389 | 297 | 11.76 (11.65–11.86) | 0.1949 (0.1728–0.2170) | |
2008 | 7372 | 4633 | 8 | 176 | 362 537 | 32 455 | 117 615 | 178 | 8.95 (8.86–9.05) | 0.1513 (0.1291–0.1736) | |
2009 | 7395 | 4570 | 0 | 134 | 360 932 | 31 964 | 121 574 | 214 | 8.86 (8.76–8.95) | 0.1760 (0.1525–0.1996) | |
2010 | 7087 | 4294 | 54 | 173 | 380 727 | 29 666 | 106 107 | 187 | 7.79 (7.71–7.88) | 0.1762 (0.1510–0.2015) | |
II | 2011 | 7009 | 4037 | 0 | 98 | 376 348 | 24 309 | 83 775 | 117 | 6.46 (6.38–6.54) | 0.1397 (0.1144–0.1649) |
2012 | 6974 | 3859 | 0 | 4 | 398 717 | 20 748 | 73 979 | 7 | 5.20 (5.13–5.27) | 0.0095 (0.0025–0.0165) | |
2013 | 7157 | 4093 | 0 | 1 | 356 279 | 18 033 | 54 091 | 1 | 5.06 (4.99–5.13) | 0.0018 (0.0000–0.0055) | |
2014 | 7248 | 4100 | 0 | 0 | 423 755 | 18 121 | 66 522 | 0 | 4.28 (4.22–4.34) | 0.0000 | |
2015 | 7571 | 4147 | 0 | 0 | 393 597 | 28 797 | 11 617 | 0 | 7.32 (7.24–7.40) | 0.0000 | |
Total | 79 351 | 48 500 | 98 | 1937 | 4 119 055 | 350 712 | 1 350 028 | 2408 | – | – |