Table 1. Investigation on Oncomelania hupensis and its breeding area in the affected areas of Qujiang and Yingde, Guangdong Province from April to August 2019.
| County-level jurisdiction | No. of snail environment | Environment type | Environmental area (m2) | No. of survey system frames | No. of live snail frames | Rate of live snail frames | No. of live snails collected |
Live Oncomelania density (No./ frame) |
| Qujiang | 1 | Ditch | 78 | 43 | 6 | 13.95 | 147 | 3.42 |
| Qujiang | 2 | Ditch | 1,575 | 12 | 1 | 8.33 | 1 | 0.08 |
| Qujiang | 3 | Ditch | 400 | 23 | 5 | 21.74 | 11 | 0.48 |
| Qujiang | 4 | Ditch | 800 | 174 | 115 | 66.09 | 794 | 4.56 |
| Qujiang | 5 | Ditch | 60 | 26 | 1 | 3.85 | 1 | 0.04 |
| Qujiang | 6 | Waste land | 865 | 66 | 1 | 1.52 | 1 | 0.02 |
| Qujiang | 7 | Waste land | 5,004 | 133 | 2 | 1.50 | 2 | 0.02 |
| Qujiang | 8 | Ditch | 50 | 13 | 2 | 15.38 | 5 | 0.38 |
| Qujiang | 9 | Ditch | 50 | 12 | 4 | 33.33 | 20 | 1.67 |
| Qujiang | 10 | Ditch | 320 | 308 | 1 | 0.32 | 17 | 0.06 |
| Qujiang | 11 | Ditch | 65 | 28 | 4 | 14.29 | 16 | 0.57 |
| Qujiang | 12 | Ditch | 175 | 33 | 3 | 9.09 | 6 | 0.18 |
| Qujiang | 13 | Waste land | 2,200 | 262 | 4 | 1.53 | 16 | 0.06 |
| Qujiang | 14 | Ditch | 240 | 83 | 1 | 1.20 | 1 | 0.01 |
| Qujiang | 15 | Waste land | 30 | 11 | 3 | 27.27 | 15 | 1.36 |
| Qujiang | 16 | Waste land | 50 | 11 | 2 | 18.18 | 15 | 1.36 |
| Qujiang | 17 | Waste land | 7,178 | 414 | 54 | 13.04 | 97 | 0.23 |
| Yingde | 18 | Waste land | 10,525 | 32 | 11 | 34.38 | 164 | 5.13 |
| Yingde | 19 | Ditch | 1,592 | 31 | 8 | 25.81 | 63 | 2.03 |
| Yingde | 20 | Waste land | 22,056 | 55 | 17 | 30.91 | 179 | 3.25 |
| Yingde | 21 | Waste land | 2,653 | 111 | 26 | 23.42 | 144 | 1.30 |
| Yingde | 22 | Waste land | 1,781 | 70 | 25 | 35.17 | 154 | 2.20 |
| Yingde | 23 | Waste land | 2,164 | 77 | 7 | 9.09 | 590 | 7.66 |
| Yingde | 24 | Waste land | 7,676 | 77 | 12 | 15.58 | 28 | 0.36 |
| Yingde | 25 | Waste land | 13,603 | 98 | 21 | 21.43 | 300 | 3.06 |
| Yingde | 26 | Waste land | 8,935 | 36 | 11 | 30.56 | 28 | 0.78 |
| Yingde | 27 | Waste land | 2,175 | 73 | 5 | 6.85 | 25 | 0.34 |
| Yingde | 28 | Ditch | 4,064 | 138 | 11 | 7.97 | 37 | 0.27 |
| Yingde | 29 | Waste land | 1,752 | 17 | 2 | 11.76 | 13 | 0.76 |
| Yingde | 30 | Waste land | 337 | 18 | 8 | 44.44 | 90 | 5.00 |
| Yingde | 31 | Ditch | 259 | 99 | 42 | 42.42 | 629 | 6.35 |
| Yingde | 32 | Waste land | 10,599 | 347 | 18 | 5.19 | 89 | 0.26 |
| Yingde | 33 | Waste land | 6,215 | 147 | 4 | 2.72 | 33 | 0.22 |
| Yingde | 34 | Waste land | 6,245 | 162 | 10 | 6.17 | 189 | 1.17 |
| Yingde | 35 | Ditch | 278 | 175 | 102 | 58.29 | 726 | 4.15 |
| Yingde | 36 | Ditch | 250 | 43 | 8 | 18.60 | 25 | 0.58 |
| Yingde | 37 | Ditch | 620 | 169 | 1 | 0.59 | 1 | 0.01 |
| Yingde | 38 | Ditch | 1,370 | 238 | 44 | 18.49 | 1,312 | 5.51 |
| Yingde | 39 | Ditch | 200 | 35 | 20 | 57.14 | 76 | 2.17 |
| Yingde | 40 | Ditch | 300 | 107 | 1 | 0.93 | 1 | 0.01 |
| Total | 124,789 | 4,007 | 623 | 15.55 | 6,061 | 1.51 |