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Feng T.,National Institute of Parasitic Diseases | Xu J.,National Institute of Parasitic Diseases | Hang D.-R.,Jiangsu Institute of Schistosomiasis | Wu Z.-S.,Institute of Parasitic Diseases | And 9 more authors.
Chinese Journal of Schistosomiasis Control | Year: 2011

Objective: To understand the conditions of schistosomiasis laboratories at county level, so as to supply the information for diagnostic capacity building. Methods: A questionnaire survey was conducted at 40 random selected counties which were in charge of national surveillance for schistosomiasis. The information of staffs, areas of laboratories, equipment configuration and diagnostic methods from each laboratory were collected. The serum specimens and Kato-Katz thick smears from the national surveillance sites were randomly selected and retested by provincial staffs to evaluate the testing ability of the personnel. Results: The average age of laboratory staffs was 40.93±9.56 years old, 69.39% of staffs were older than 35 years, 86.22% of them had education background below bachelor degree. Except missed professional titles of 4 persons, the staffs with primary, middle and high professional titles accounted for 56.63%, 39.29% and 2.04%, respectively. The laboratory areas varied greatly while independent schistosomiasis stations had the lowest areas with 52.81±40.08 m 2, and the equipment configurations of laboratories were in a low level. The consistency rates of primary test and reexamination for serum specimens and thick smear slides were 95.89% and 99.53%, respectively, with the Kappa value over 0.90. Nine immunodiagnostic kits were used in these laboratories, and Kato-Katz technique and miracidium hatching technique were the main parasitological methods. Conclusions: The personnel structure of laboratories at primary prevention and treatment facilities for schistosomiasis is unreasonable, while the basic infrastructure of laboratories is backward and the use of diagnostic assays/methods is disordered. The diagnostic capacity building should be strengthened, and the construction and management of schistosomiasis laboratories should be standardized. Source


Yin J.X.,Yunnan Provincial Institute of Endemic Disease Control and Prevention
Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi | Year: 2013

To explore the predictors on the abundance of Rattus (R.) tanezumi in households of commensal rodent plague foci. Thirty natural villages that experienced previous plague cases in Lianghe county, Yunnan province, were selected followed by random selection of 20 households in each village through computer technique. Live traps were set in households to capture small mammals which were then identified to species in the field according to their morphological features. Data on potential factors for abundance of R. tanezumi were collected through questionnaires and field observation and were coded and computerized using EpiData software and further analyzed by hurdle regression model under R software. A total of 166 rodents (133 R. tanezumi and 33 Suncus murinus) were captured. from final multilevel hurdle regression model showed that the likelihood of R. tanezumi captures increased by 1.67- to 2.76-fold in households belonged to Dai ethnic families that stored foodstuff in metal pail, often raising dogs, and having adjacent houses. The number of R. tanezumi captures increased by 2.18-fold in the villages where over 80% of the households would raise chickens. In the villages with communal latrine, the likelihood and the number of R. tanezumi capture increased 1.93-fold and 2.38-fold, respectively. While the likelihood of R. tanezumi captures would reduce by 45% - 61% in those households where there were cats and cattle being raised and maize grown in the village. The number of R. tanezumi captures would reduce by 63% in the households where there were outside toilet. The abundance of R. tanezumi seemed to be closely related to the ecological environment factors. Programs on plague control and prevention should relate to ecological factors that influencing the abundance of R. tanezumi. Source


Dong Y.,Yunnan Provincial Institute of Endemic Disease Control and Prevention | Li Z.-H.,Dali University | Feng X.-G.,Yunnan Provincial Institute of Endemic Disease Control and Prevention | Dong X.-Q.,Yunnan Provincial Institute of Endemic Disease Control and Prevention
Chinese Journal of Schistosomiasis Control | Year: 2011

Objective: To analyze the relationship between Oncomelania snail distribution and environmental remote sensing indexes in hilly and mountainous areas. Method: The normalized different vegetation index (NDVI), land surface temperature (LST), humidity index (Wetness) of 85 snail spots in Dali City were extracted for statistical analysis by TM image, and the land-use types were classified. LST, NDVI, Wetness, snail density and land-use types were overlaid and analyzed by using a weight of suitability model of ArcGIS 9.2, and snail appropriate distribution range in Dali City was calculated. Results: The distribution of LST, NDVI, Wetness values of the investigated snail points were approximately normal, and most of the snail points distributed nearby the average values of the remote sensing alternate indexes, then gradually reduced to the ends. More than 90% of the snail spots were distributed in the land type with crops and grassland. The environments in Dali City were divided into unsuitable snail environment (0-14 points), suitable snail environment (15-21 points), and optimum snail environment (22-26 points) by the weight suitability mode. Conclusions: Environmental remote sensing indicators can reflect the environmental factors affecting snail distribution directly. Combining remote sensing with GIS and field survey can describe, judge and forecast the distribution of snails. Source


Dong Y.,Yunnan Provincial Institute of Endemic Disease Control and Prevention | Feng X.-G.,Yunnan Provincial Institute of Endemic Disease Control and Prevention | Huang P.,Yunnan Provincial Institute of Endemic Disease Control and Prevention | Dong X.-Q.,Yunnan Provincial Institute of Endemic Disease Control and Prevention | And 2 more authors.
Chinese Journal of Schistosomiasis Control | Year: 2013

Objective: To evaluate the effect of a water-saving irrigation project on schistosomiasis control. Methods: The Oncomelania snail situation before and after the water-saving irrigation project was investigated, and the data of snails and schistosomiasis of people in the area of the water-saving irrigation engineering were collected and analyzed statistically. Results: The incidence of frames with snails declined from 10.70% to 2.27% after actualized water-saving irrigation project, and the snail density declined from 0.42 snails/0.1 m 2 to 0.10 snails/0.1 m2. The snails were eliminated in 57% of the ditches. The snail area and schistosome infection rate of residents declined obviously. Conclusion: The water-saving irrigation project is effective in schistosomiasis control and has good social and economic benefits. Source

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