Table 2. Efficacy of the pilot program for cystic hydatid disease control using dogs and sheep as markers of Echinococcus granulosus infection after monthly treatment of dogs with praziquantel in Hutubi County (1987–1990) and Wensu County (1990–1994), Xinjiang, China.
| Yeara | Dog/Sheep – Age (y) | Hutubi County | Wensu County | ||||
| Checked, n | Positive, n (%) | Reduction %b | Checked, n | Positive, n (%) | Reduction, %b | ||
| 0 | Dog | 178 | 33 (18.5) | - | 116 | 17 (14.7) | - |
| Sheep - 1 | 569 | 473 (83.1) | - | 95 | 77 (81.1) | - | |
| Sheep - 2 | 155 | 136 (87.7) | - | 92 | 64 (69.6) | - | |
| Sheep - 3 | 46 | 42 (91.3) | - | 90 | 62 (68.9) | - | |
| Sheep - 4 | 120 | 113 (94.2) | - | 89 | 67 (75.3) | - | |
| Sheep ≥5 | 382 | 366 (95.8) | - | - | - | - | |
| Sub-sheep | 1,272 | 1,130 (88.8) | - | 366 | 270 (73.8) | - | |
| 1st | Dog | 220 | 5 (2.3) | 87.6 | 741 | 12 (1.6) | 89.0 |
| Sheep - 1 | 30 | 4 (13.3) | 84.0 | 92 | 17 (18.5) | 77.2 | |
| 2nd | Dog | 119 | 0 (0) | 100 | 790 | 4 (0.5) | 96.0 |
| Sheep - 1 | 30 | 4 (13.3) | 84.0 | 102 | 6 (5.9) | 92.7 | |
| Sheep - 2 | 30 | 5 (16.7) | 81.0 | 90 | 7 (7.8) | 90.6 | |
| Sub-sheep | 60 | 9 (15.0) | 82.2 | 192 | 13 (6.8) | 91.0 | |
| 3rd | Dog | 120 | 0 (0) | 100 | 603 | 1 (0.2) | 98.6 |
| Sheep - 1 | 30 | 1 (3.3) | 96.0 | 93 | 0 (0) | 100 | |
| Sheep - 2 | 30 | 1 (3.3) | 96.2 | 90 | 5 (5.5) | 90.6 | |
| Sheep - 3 | 30 | 3 (10.0) | 89.5 | 91 | 6 (6.6) | 91.0 | |
| Sub-sheep | 90 | 5 (5.6) | 93.3 | 274 | 11 (4.0) | 94.5 | |
| 4th | Dog | - | - | - | 111 | 0 (0) | 100 |
| Sheep -1 | - | - | - | 101 | 0 (0) | 100 | |
| Sheep - 2 | - | - | - | 94 | 1 (1.1) | 98.5 | |
| Sheep - 3 | - | - | - | 83 | 0 (0) | 100 | |
| Sheep - 4 | - | - | - | 83 | 4 (4.8) | 93.5 | |
| Sub-sheep | - | - | - | 361 | 5 (1.4) | 98.1 | |
a
0 indicates the baseline survey before dog mass treatment with praziquantel, 1st, 2nd, 3rd and 4th indicate the first, second, third, and fourth year after control study commencement.
b
Reduction % = [prevalence of baseline survey-prevalence of E. granulosus in dogs or echinococcosis in new born sheep]/prevalence of baseline survey. All infection rates were significantly less than those obtained during the baseline survey by Z test.
Sub-sheep, sub-total of sheep in bold categories.