Table 1 Changes of infection rates of schistosomes in population during 2005–2015 in sentinel sites
Phase | Year | IHA test | No. stool samples received examinationa | Kato-Katz | No. HT positives | No. parasitological positives | Infection rate (%, 95 CI) | |||
|---|---|---|---|---|---|---|---|---|---|---|
No. sera samples examined | No. positives | Antibody positive rate, % (95% CI) | No. KK positives | Arithmetic mean EPG (mean ± SD) | ||||||
I | 2005 | 72 595 | 12 686 | 17.48 (17.20–17.75) | 12 226 | 1447 | 12.37 ± 124.62 | – | 1447 | 2.07 (1.96–2.17) |
2006 | 64 336 | 8770 | 13.63 (13.37–13.90) | 8406 | 961 | 10.95 ± 88.34 | – | 961 | 1.56 (1.46–1.65) | |
2007 | 60 535 | 7484 | 12.36 (12.10–12.63) | 7215 | 537 | 3.16 ± 22.88 | – | 537 | 0.92 (0.84–1.00) | |
2008 | 63 202 | 6670 | 10.55 (10.31–10.79) | 6104 | 416 | 3.03 ± 25.44 | – | 416 | 0.72 (0.65–0.79) | |
2009 | 62 039 | 5523 | 8.90 (8.68–9.13) | 5293 | 304 | 2.71 ± 22.89 | – | 304 | 0.51 (0.46–0.57) | |
2010 | 59 311 | 5636 | 9.50 (9.27–9.74) | 5358 | 314 | 4.93 ± 143.59 | – | 314 | 0.56 (0.50–0.62) | |
II | 2011 | 54 550 | 4249 | 7.79 (7.56–8.01) | 4155 | 194 | 1.94 ± 16.21 | 222 | 289 | 0.54 (0.48–0.60) |
2012 | 53 040 | 3869 | 7.29 (7.07–7.52) | 3759 | 136 | 1.47 ± 14.76 | 102 | 173 | 0.34 (0.29–0.38) | |
2013 | 50 648 | 3349 | 6.61 (6.4.40–6.83) | 3163 | 75 | 0.70 ± 6.54 | 95 | 112 | 0.23 (0.19–0.28) | |
2014 | 47 457 | 2858 | 6.02 (5.81–6.24) | 2802 | 32 | 0.41 ± 6.38 | 42 | 48 | 0.10 (0.07–0.13) | |
2015 | 43 963 | 2608 | 5.93 (5.71–6.15) | 2600 | 36 | 1.14 ± 14.96 | 46 | 55 | 0.13 (0.09–0.16) | |
Total | 631 676 | 63 702 | – | 61 081 | 4452 | – | 507 | 4656 | – | |