Volume 11, Number 10—October 2005
Emerging Foodborne Trematodiasis
|Study site, period (reference)||Population sample||Characteristics of water body||Prevalence||RR (95% CI)|
|Asillo irrigation area, Peru, 1999 (26)||338 school children||500-hectare irrigation area with irrigation canals and drainage channels||Fasciola hepatica: 18.8%, 20.3%, 31.3% in 3 schools in irrigation scheme||NA|
|Kimhae county, Republic of Korea, 1974 (27)||1,809||River region||Clonorchis sinensis: 72.1% near riverside and 41.3% inland||1.74 (1.57–1.92)|
|Goyang county, Republic of Korea, 1974 (27)||578||River region||C. sinensis: 32.7% near riverside and 6.3% inland||5.16 (3.04–8.75)|
|Hadong Gun, Republic of Korea, 1978 (28)||1,163||Rivers and streams||Metagonimus yokogawai: 5.4%–90.8% in villages close to river and streams and 4% in village 4 km from river||7.44 (2.83–19.54)|
|Pohang industrial belt, Republic of Korea, 1989 (29)||3,180 employees; 200 for questionnaire analysis||Hyungsai River basin||C. sinensis: 52% of infected employees lived near river compared with 27.9% of uninfected employees||1.85 (1.28–2.67)|
|Okcheon-gun, Republic of Korea, 2000 (30)||1,081||Geum-Gang River||C. sinensis: 14.2% of inhabitants near river were infected with C. sinensis compared with 3.2% of inland residents||4.51 (2.64–7.70)|
|Metagonimus spp.: 8.4% of inhabitants near river were infected, compared with 1.7% of inland residents||5.01 (2.40–10.46)|
|Nong Wai irrigation area, Khon Kaen, Thailand, 1974–1975 (31)||627 children||Irrigation canal and channels||Opisthorchia viverrini: 7.3% in irrigated villages and 3.3% in nonirrigated villages||2.20 (0.87–5.51)|
|Nam Pong development project, Khon Kaen province, Thailand, 1977–1978 (21)||3,183||Reservoir and irrigation scheme||O. viverrini: 27.1% in irrigated villages and 17.2% in traditional villages (no irrigation)||1.63 (1.34–2.00)|
|O. viverrini: 10.8% lakeside and 11.5% in resettlement areas||0.93 (0.66–1.31)|
|Chonnabot village, Khon Kaen province, Thailand, 1980–1982 (32)||4,638; 246 included for incidence calculation||Wide shallow reservoirs that remained dry in 1981–1982||O. viverrini: 47% in uninfected individuals becoming positive within 1 year while reservoirs were flooded and 20% during period when reservoirs were dry†||2.17 (1.42–3.29)|
|18 villages in Nong Khai and Loei provinces, Thailand, 1981–1982 (33)||1,259||Khong River and Huang River (flowing water)||O. viverrini: 51.7% and 52.6% in villages >5 km from river and 27.9% and 21.7% in villages closer to river||0.47 (0.40–0.56)|
|12 provinces of Vietnam, 1994–2000 (34)||>20,000||Red River delta region||C. sinensis: £31% in coastal delta region, 5% in mountainous area, and 16.3% in highlands. O. viverrini: highest in urban coastal areas||NA|
|Mantaro valley, Peru, 2000 (35)||206 children||Small streams||Odds ratio 17.22|
|All studies||2.15 (1.38–3.36)|
*RR, relative risk; CI confidence interval; NA, not available.
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