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1.
Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi ; 31(4): 368-373, 2019 Sep 25.
Artigo em Chinês | MEDLINE | ID: mdl-31612670

RESUMO

OBJECTIVE: To develop a method for designing schistosomiasis surveillance sites, so as to improve the efficiency and quality of schitsosomiasis surveillance. METHODS: By using the minimum spanning tree-based Spatial Kluster Analysis by Tree Edge Removal (SKATER) method, spatially constrained clustering was performed upon 31 historical schistosomiasis-endemic counties (districts) in Anhui Province. A surveillance site was selected from each cluster to evaluate the representativeness and surveillance efficiency of these cluster-based surveillance sites for the endemic situation of schistosomiassi in Anhui Province, and to compare the surveillance efficiency with local national schistosomiasis surveillance sites. RESULTS: There was no significant difference in the environmental factors between the cluster-based schistosomiasis surveillance sites and the whole region, showing a high homogeneity. If the same number of schistosomiasis surveillance sites was selected, there was no significant difference between the cluster-based surveillance sites and national schistosomiasis surveillance sites in the efficiency of the mean risk and long-term trend of schistosomiasis surveillance in Anhui Province; however, the cluster-based surveillance sites were superior to the national schistosomiasis surveillance sites for the prediction and estimation of the endemic situation of schistosomiasis in the unmonitored areas. CONCLUSIONS: The SKATER-based selection of schistosomiasis surveillance sites may better represent the endemic situation of schistosomiasis in Anhui Province, which may serve as an effective supplement for the conventional method of selecting schistosomiasis surveillance sites.


Assuntos
Métodos Epidemiológicos , Vigilância da População , Esquistossomose , Caramujos , Animais , China/epidemiologia , Análise por Conglomerados , Humanos , Vigilância da População/métodos , Schistosoma/fisiologia , Esquistossomose/epidemiologia , Esquistossomose/prevenção & controle , Caramujos/parasitologia , Análise Espacial
2.
Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi ; 31(3): 269-274, 2019 Aug 28.
Artigo em Chinês | MEDLINE | ID: mdl-31544405

RESUMO

OBJECTIVE: To explore the spatial-temporal clustering distribution of schistosomiasis transmission risk in Yunnan Province from 2004 to 2015, so as to provide scientific evidence for the future schistosomiasis control and consolidation of the control achievements. METHODS: All data pertaining to endemic situation of human and bovine schistosomiasis and snail survey at a township level in Yunnan Province from 2004 to 2015 were collected. A descriptive epidemiological method and Joinpoint model were used to describe the changing trends of Schistosoma japonicum infections in humans, bovine and snails, and the hotspots and clusters of schistosomiasis transmission risk were identified using spatial autocorrelation analysis, hotspots analysis and retrospective space-time scan statistic in Yunnan Province from 2004 to 2015. RESULTS: The prevalence of S. japonicum infections appeared a continuous decline in humans, bovine and snails in Yunnan Province from 2004 to 2015, and the estimated number of schistosomiasis cases reduced from 43 056 in 2004 to 756 in 2015, with a decline rate of 98.24%. There were no acute cases since 2008 and no infected snails since 2014 in Yunnan Province. There were significant differences in the changing trends of human and bovine S. japonicum infections in Yunnan Province between 2012 and 2015 and between 2013 and 2015, respectively using the Joinpoint model (P < 0.05). In addition, there was a spatial autocorrelation in human S. japonicum infections in Yunnan Province from 2004 to 2013 (P < 0.01), and the hotspots areas for human S. japonicum infections were mainly distributed in some townships from Dali City, Weishan County and Eryuan County. Retrospective spatial-temporal scanning revealed that S. japonicum human, bovine and snail infections were clustered in 23, 15, 4 townships from Dali City, Weishan County, Eryuan County, Nanjian County and Heqing County, respectively, with relative risks of 6.25 to 28.75 (P < 0.01), which was almost consistent with the cluster areas detected by hotspots analysis. CONCLUSIONS: The endemic situation of schistosomiasis significantly reduced in Yunnan Province from 2004 to 2015; however, there is still a risk of schistosomiasis transmission. The monitoring and control of schistosomiasis should be intensified in the future in Yunnan Province.


Assuntos
Esquistossomose Japônica , Esquistossomose , Animais , Bovinos , China , Humanos , Estudos Retrospectivos , Fatores de Risco , Esquistossomose/epidemiologia , Esquistossomose/prevenção & controle , Esquistossomose/transmissão , Caramujos , Análise Espaço-Temporal
3.
Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi ; 30(5): 493-499, 2018 May 30.
Artigo em Chinês | MEDLINE | ID: mdl-30567017

RESUMO

OBJECTIVE: To investigate the status of Oncomelania hupensis snails in Anhui Province in 2016, so as to provide the evidence for formulating the 13th Five-Year Plans for Schistosomiasis Control. METHODS: In 2016, a snail survey was conducted in Anhui Province according to the National Programme of the Oncomelania Snail Survey, covering all snail habitats or historical snail habitats and suspected environments of snail breeding, and the results of the survey were analyzed. RESULTS: In 2016, 22 848 environments were surveyed, and no schistosome-infected snails were found. There were 17 927 historical snail habitats in whole province, among which, the environments without changes, changed partly and changed completely accounted for 71.2%, 19.3% and 9.5%, respectively. The area of historical snail habitats was 1.410 billion m2. There were 4 830 environments with snail habitats covering an area of 0.265 billion m2 in 38 counties of 7 cities, including newly emerging area of 1 287.65 hm2 and reemerging area of 1 375.32 hm2. The density of living snails was 0.392 0 snails/0.1 m2, and the rate of frame with living snails was 12.93%. The type of marshland and lake regions, and the type of hilly and mountainous regions accounted for 22.4% and 77.6% of number of snail habitats, and accounted for 86.7% and 13.3% of areas of snail habitats, respectively. Among the different types of vegetation in snail habitats, grass was superior owe to accounting for 82.2% of the number of snail habitats, 57.3% of the area with snail habitats, and the highest density of living snails (0.413 9 snails/0.1 m2). Among the different types of environments in snail habitats, the ditch was superior owe to accounting for 56.8% of the number of snail habitats, the highest density of living snails (0.570 3 snails/0.1m2) and the highest rate of frame with living snails (18.57%), and the beach was superior owe to accounting for 87.8% of the area with snail habitats. In Anhui Province, the first year of snails and schistosome-infected snails being found was 1950 and 1952, respectively, and the latest year of schistosome-infected snails being found was 2012. The map showed that the most environments with snail habitats were distributed along the Yangtze River in Anhui Province. CONCLUSIONS: For the first time, the investigation has built the database and map of snail spatial distribution, which truly reflect the historic and current status of snail distribution in Anhui Province and can provide the evidence for formulating the 13th Five-Year Plans for Schistosomiasis Control and improving the schistosomiasis prevention and control work in the future.


Assuntos
Schistosoma/fisiologia , Caramujos , Distribuição Animal , Animais , China/epidemiologia , Lagos , Rios , Esquistossomose/epidemiologia , Esquistossomose/prevenção & controle , Caramujos/parasitologia
4.
Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi ; 31(3): 291-293, 2018 Jun 01.
Artigo em Chinês | MEDLINE | ID: mdl-31544409

RESUMO

OBJECTIVE: To investigate the species and activities of wild animals infected with schistosome in hilly and mountain areas by using an infrared camera technique, so as to provide the evidence for the surveillance of schistosomiasis in these areas. METHODS: Six infrared cameras were selected and placed in 6 environments of the risk monitoring points of schistosomiasis in Shitai County in Anhui Province. The species and activities of the wild animals in the 6 environments were observed through the photographs and videos taken by the cameras. RESULTS: Through 5 day's monitoring, 3 wild mammals, such as voles, hares and wild boars, were found in 4 monitoring environments, of which voles were found at 2 environments with snails, and hares, wild boars and voles were found in 2 environments adjacent to environments with snails respectively. The monitoring showed that the vole activity was most frequent in the monitored environment. CONCLUSIONS: The use of infrared camera technique has a good effect in the investigation of wild animal infectious source of schistosomiasis, and it is also suitable for the monitoring work in other types of environments.


Assuntos
Distribuição Animal , Animais Selvagens , Raios Infravermelhos , Mamíferos , Fotografação , Esquistossomose , Animais , Animais Selvagens/parasitologia , China , Reservatórios de Doenças , Mamíferos/parasitologia , Mamíferos/fisiologia , Schistosoma , Esquistossomose/transmissão , Caramujos
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