Type of area | Regions | No. examined | Positive | |
---|---|---|---|---|
No. | % (95%CI) | |||
City | Lanzhou | 148 | 23 | 15.54 (9.7-21.38) |
 | Xining | 15 | 1 | 6.7 (0-19.29) |
Graze area | Huzhu | 20 | 2 | 10 (0-23.15) |
 | Pingan | 10 | 0 | 0 |
 | Huangyuan | 10 | 0 | 0 |
 | Haibei | 30 | 4 | 13.33 (1.17-25.5) |
 | Hainan | 35 | 4 | 11.43 (0.89-21.97) |
Total | 268 | 34 | 12.69 (8.64-16.55) |