Volume 11, Number 8—August 2005
Letter
Echinococcosis, Ningxia, China
Yu Rong Yang*†, Tao Sun†, Zhengzhi Li†, Xiuping Li†, Rui Zhao†, Li Cheng‡, Xiao Pan§, Philip S. Craig¶, Dominique A. Vuitton#, and Donald P. McManus*
Table
Average incidence of human echinococcosis (AE/CE combined), 1994–2001, and incidence compared for ethnicity (Han/Hui) in southern Ningxia and Yinchuan City*
| Location (population) | 1994–2001 |
Ethnicity comparison |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Hui (1994–2001) |
Han (1994–2001) |
|||||||||
| Cases | Incidence† | %‡ | Cases | Incidence† | %‡ | Cases | Incidence† | IRR | 95% CI | |
| Ningxia | ||||||||||
| Tongxin (328,700) | 353 | 13.42 | 81.49 | 291 | 13.58 | 18.48 | 62 | 12.75 | 0.94 | 0.71–1.25§ |
| Haiyuan (344,000) | 305 | 11.08 | 70.58 | 195 | 10.04 | 28.52 | 110 | 14.01 | 1.40 | 1.10–1.77 |
| Guyuan (470,700) | 226 | 6.00 | 43.23 | 108 | 6.63 | 56.70 | 118 | 5.52 | 0.83 | 0.64–1.09§ |
| Xiji (403,100) | 198 | 6.14 | 52.00 | 89 | 5.30 | 47.99 | 109 | 7.04 | 1.33 | 0.99–1.77§ |
| Pengyang (231,000) | 101 | 5.46 | 29.77 | 46 | 8.36 | 70.23 | 55 | 4.24 | 0.51 | 0.34–0.76 |
| Longde (197,300) | 8 | 0.50 | 8.98 | 1 | 0.70 | 91.01 | 7 | 0.53 | 0.76 | 0.1–16§ |
| Jingyuan (81.301) | 1 | 0.15 | 96.50 | 1 | 0.15 | 3.48 | 0 | 0 | — | § |
| Subtotal (2,056,101) | 1,192 | 7.24 | — | — | — | — | — | — | — | — |
| Yinchuan (1,614,700) | 165 | 1.27 | 18.36 | 59 | 2.48 | 79.88 | 106 | 1.02 | 0.41 | 0.3–0.57 |
| Total (3,670,801) | 1,357 | 4.62 | 33.88 | 790 | 7.94 | 65.47 | 567 | 2.94 | 0.37 | 0.33–0.41 |
*AE, alveolar echinococcosis; CE, cystic echinococcosis; IRR, incidence risk ratio; CI, confidence interval.
†Cases/100,000/year.
‡Ethnicity composition ratio (%) at each location.
§Comparison between ethnicity composition ratio and incidence not significant.
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