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Oncomelania

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https://www.readbyqxmd.com/read/29556731/seasonal-variations-of-pcdd-fs-in-fishes-inferring-a-hidden-exposure-route-from-na-pcp-application-for-schistosomiasis-control
#1
Yuming Hu, Chuanzhu Yi, Jingguang Li, Xiaohong Shang, Zimin Li, Xiaochen Yin, Bo Chen, Yuechan Zhou, Yinyin Zhang, Yongning Wu
Japanese schistosomiasis was endemic in Dongting Lake, the second largest freshwater lake in China. The technical sodium pentachlorophenate (Na-PCP) was widely used during the period between the early 1960s and early 1990s to kill oncomelania, the intermediate host of Schistosomes. However, polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) also contaminated the environment of Dongting Lake due to trace impurities of Na-PCP. In this study, 13 species of freshwater fish were collected from Dongting Lake and analyzed in wet and dry seasons...
March 19, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29540206/three-gorges-dam-polynomial-regression-modeling-of-water-level-and-the-density-of-schistosome-transmitting-snails-oncomelania-hupensis
#2
Ya Yang, Jianchuan Gao, Wanting Cheng, Xiang Pan, Yu Yang, Yue Chen, Qingqing Dai, Lan Zhu, Yibiao Zhou, Qingwu Jiang
BACKGROUND: Schistosomiasis remains a major public health concern in China. Oncomelania hupensis (O. hupensis) is the sole intermediate host of Schistosoma japonicum, and its change in distribution and density influences the endemic S. japonicum. The Three Gorges Dam (TGD) has substantially changed the downstream water levels of the dam. This study investigated the quantitative relationship between flooding duration and the density of the snail population. METHODS: Two bottomlands without any control measures for snails were selected in Yueyang City, Hunan Province...
March 14, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29536719/-final-evaluation-of-medium-and-long-term-program-of-schistosomiasis-control-in-baise-city
#3
Deng Ji-Guang, Yu Shui-Lan, Nong Zhi, Jiang Zhi-Hua
OBJECTIVE: To evaluate the monitoring results of medium- and long-term program of schistosomiasis control in Baise City, so as to provide the reference for the elimination of schistosomiasis. METHODS: The data of schistosomiasis control in Baise City from 2004 to 2015 were collected and analyzed. RESULTS: By the end of 2015, the total number of regular screening serum tests for schistosomiasis in the planning period was 10 244 person-times, with 649 positive cases...
December 7, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29536709/-survey-of-knowledge-and-practice-of-residents-about-schistosomiasis-prevention-and-control-in-endemic-areas-of-jingzhou-city
#4
Li Yan-Wei, Hu He-Hua, He Zheng-Wen, Xu Zhao-Gang, Zhang Chun-Bin, Zhou Xiao-Shan, Li Yao, Liu Rong, Dong Hui-Fen, Zhao Qin-Ping
OBJECTIVE: To investigate the knowledge and practice of residents about schistosomiasis prevention and control in endemic areas of Jingzhou City, Hubei Province after the disease transmission being controlled, so as to provide the valuable information for formulating an efficient health education and intervention strategy. METHODS: The residents were selected by using the cluster sampling method and investigated with questionnaires in Jiangling County and Gong'an County, Jingzhou City, Hubei Province, and the data were analyzed by using the descriptive analysis method, Chi-square tests and logistic regression...
November 16, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29536701/-research-on-living-status-of-oncomelania-hupensis-in-autumn-and-winter-and-its-correlates-in-eastern-dongting-lake-area
#5
Cheng Wan-Ting, Pan Xiang, Yang Ya, Yang Yu, Li Lin-Han, He Zhong, Cai Bin, Wan Wei, Jiang Jie, Jiang Qing-Wu, Zhou Yi-Biao
OBJECTIVE: To explore the dynamic changes of Oncomelania hupensis snail densities in autumn and winter and the relationship between hydrological and meteorological factors and snail growth and decline. METHODS: From Octobers to Decembers of 2007 to 2014, a bottomland close to eastern Dongting Lake was selected as the study field. The snails and elevation of the points were surveyed, and the hydrological and meteorological data were collected. The snail densities and death rates of every month were calculated...
December 11, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29536700/-cost-effectiveness-of-comprehensive-schistosomiasis-control-strategy-with-focus-on-cattle-and-sheep-removal-in-junshan-district-yueyang-city
#6
Yang Ya, Li Jian-Bing, Liu Hao, Li Shi-Gui, He Zhong, Cai Bin, Li Lin-Han, Cheng Wan-Ting, Yang Yu, Zhou Jie, Li Zhi-Yang, Ren Guang-Hui, Luo Zhi-Hong, Zhou Yi-Biao, Jiang Qing-Wu
OBJECTIVE: To evaluate the cost-effectiveness of comprehensive schistosomiasis control measures with focus on total removal of cattle and sheep in Juanshan District, Yueyang City. METHODS: The schistosome infection status of human, cattle, sheep and Oncomelania hupensis snails and costs of control measures were gathered during the period of 2006 to 2016. The costs for different periods and cost-effectiveness ratios were calculated. RESULTS: The prevalence of schistosome infection in residents in the pilot villages decreased from 3...
December 26, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29508598/-oncomelania-hupensis-status-monitoring-in-changzhou-city-jiangsu-province-from-2013-to-2016
#7
H E Ming-Zhen, X Yi-Qing, C Hong, Z Yong-Gen, Z Shi-Ying, G Yan-Li
Objective To analyze the Oncomelania hupensis snail distribution and the changes of snail situation in Changzhou City from 2013 to 2016, so as to provide the evidence for formulating the schistosomiasis prevention and control interventions. Methods The data of snail monitoring in Changzhou City from 2013 to 2016 were collected and statistically analyzed. Results The total area with snails was 40.17 hm2 and the newly discovered area was 30.63 hm2 in Changzhou City from 2013 to 2016. In the four years, 3 454 snails were dissected, and no schistosome infected snails were found...
April 27, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29508596/-analysis-of-epidemic-situation-of-schistosomiasis-in-wuhu-county-from-2012-to-2016
#8
X I Xing-Wang
Objective To analyze the epidemic situation of schistosomiasis in Wuhu County from 2012 to 2016, so as to provide the reference for adjusting the control strategy. Methods The data of schistosomiasis prevention and control in Wuhu County from 2012 to 2016 were collected and longitudinally analyzed. Results Since 2013, the average infection rate of schistosomiasis in the population decreased year by year, and the infection rate decreased to 0 in 2016. Since 2012, the infection rate of livestock was 0. The area with Oncomelania hupensis snails decreased year by year, but it drastically rebounded in 2016...
August 14, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29508583/-study-of-schistosomiasis-transmission-interruption-based-on-intensive-agriculture
#9
L U Ding, T Ben-Fu, D Qi-Hua, C Lin, Z Bo
Objective To study the effect of schistosomiasis transmission interruption model based on intensive agriculture in hilly endemic areas, so as to provide the reference for the similar endemic areas. Methods Based on the development of intensive agriculture in Guanghan City, a comprehensive demonstration area of schistosomiasis control with measures such as new rural construction, hardening ditches, the adjustment of industrial structure and water remediation measures was constructed. Jinhua, Shiguan and Hongyan villages were chosen as the evaluation sites to comparatively analyze the indexes of intensive agriculture and schistosomiasis control effects...
August 9, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29508573/-dynamic-change-of-population-structure-of-oncomelania-hupensis
#10
W Qi-Zhi, W Feng-Feng, Z Hai, S Cheng-Song, W Yue, Y Xiao-Mei, Z Li, Z Shi-Qing, W Tian-Ping
Objective To understand the successive dynamic change of population structure of Oncomelania hupensis during a one-year period, so as to provide the evidence for snail control. Methods A river beach and a ditch infested with O. hupensis snails were selected and longitudinally investigated in the midmonth during one year. The snail survey indices included the survival status, gender, number of whorls, length and width of shell, and gonad development status (measured by the color depth of gonad and the length ratio of gonad to liver), and the monthly snail eggs in the soil were collected and counted simultaneously...
August 17, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29508572/-study-of-spatial-stratified-sampling-strategy-of-oncomelania-hupensis-snail-survey-based-on-plant-abundance
#11
W Xun-Ping, Z An
Objective To optimize and simplify the survey method of Oncomelania hupensis snails in marshland endemic regions of schistosomiasis, so as to improve the precision, efficiency and economy of the snail survey. Methods A snail sampling strategy (Spatial Sampling Scenario of Oncomelania based on Plant Abundance, SOPA) which took the plant abundance as auxiliary variable was explored and an experimental study in a 50 m×50 m plot in a marshland in the Poyang Lake region was performed. Firstly, the push broom surveyed data was stratified into 5 layers by the plant abundance data; then, the required numbers of optimal sampling points of each layer through Hammond McCullagh equation were calculated; thirdly, every sample point in the line with the Multiple Directional Interpolation (MDI) placement scheme was pinpointed; and finally, the comparison study among the outcomes of the spatial random sampling strategy, the traditional systematic sampling method, the spatial stratified sampling method, Sandwich spatial sampling and inference and SOPA was performed...
July 27, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29508571/-molluscicidal-effect-of-suspension-concentrate-of-niclosamide-ethanolamine-salt
#12
Y Yi, C Shun-Xiang, H E Zheng-Wen, L I Bo, W You-Bin, T U Zhen, X U Zhao-Gang, H E Hui, X Bo
Objective To evaluate the molluscicidal effect of suspension concentrate of niclosamide ethanolamine salt (SCNE) against Oncomelania hupensis snails in laboratory and field. Methods The experiment of SCNE against the snails by using the immersing and spraying methods was performed in laboratory and field, with control groups of wettable powder of niclosamide ethanolamine salt (WPN). Results In the laboratory, LC50(s) of SCNE for 24, 48 h and 72 h by using the immersion method were 0.092 6, 0.062 9 mg/L and 0...
July 27, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29508569/-study-on-spatial-temporal-characteristics-of-schistosoma-japonicum-infections-among-human-in-hunan-province-2004-2011
#13
H U Ben-Jiao, Z Zheng-Yuan, X Meng, L I Guang-Ping, R Guang-Hui, J Qing-Wu, Z Yi-Biao
Objective To explore the spatial-temporal characteristics and changing regularities of Schistosoma japonicum infections among human from 2004 to 2011. Methods The township level spatial databases of schistosomiasis in Hunan Province from 2004 to 2011 were established, and the related spatial analysis was performed by SPSS 17.0, ArcGIS 10.1 and SaTScan 7.03. Results The schistosome infection rate among human in Hunan Province sharply decreased from 3.0% in 2004 to 0.8% in 2011. However, the rate among residents in parts of some townships in 2011 was still hovering at a higher level ( P 90 = 2...
July 24, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29508568/-effect-of-comprehensive-schistosomiasis-control-strategy-with-focus-on-cattle-and-sheep-removal-in-junshan-district-yueyang-city
#14
L I Wen-Bin, Y Ya, P Xiang, L I Jian-Bing, L Hui-Xiang, L I Shi-Gui, H E Zhong, C Bin, L I Lin-Han, C Wan-Ting, Y Yu, Z Jie, L I Sheng-Ming, R Guang-Hui, L Zhi-Hong, Z Yi-Biao, J Qing-Wu
Objective To evaluate the effect of comprehensive schistosomiasis control measures with focus on total removal of cattle and sheep in Junshan District, Yueyang City. Methods The retrospective review and field survey were implemented in the pilot villages in Junshan District. The data of Schistosoma japonicum infection status of human, cattle, sheep and Oncomelania hupensis snails, and density of snails were gathered and modeled in the period of 2006 to 2016. Results The prevalence of schistosome infection in residents in the pilot villages decreased from 3...
August 15, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29469535/-retrospective-analysis-of-schistosomiasis-elimination-history-in-jingxi-city-guangxi-zhuang-autonomous-region
#15
Yu Shui-Lan, Deng Ji-Guang, Xu Shao-Ren, Jiang Zhi-Hua
OBJECTIVE: To understand the schistosomiasis epidemic and control history in Jingxi City, so as to provide the evidence for improving the future work. METHODS: The data of schistosomiasis prevention and control work were collected and analyzed comprehensively in Jingxi City from 1956-2015. RESULTS: From 1956, the schistosomiasis prevention and control work carried out, and in 1985, Jingxi City reached the standard of schistosomiasis transmission interrupted and no local schistosome infected residents and livestock were found for 36 years...
March 10, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29469526/-density-and-hydrostatic-settling-velocity-of-biomphalaria-straminea
#16
Min Feng-Yang, Wang Jia-Sheng, Xu Xing-Jian, Zhou Jian-Yin, Chen Li-Zhen
OBJECTIVE: To understand the eco-hydraulics characteristics of Biomphalaria straminea , the intermediate host of Schistosoma mansoni . METHODS: The drainage method and settlement tube method were applied to measure B. straminea 's density and hydrostatic settling velocity respectively. RESULTS: The density of B. straminea was 1.04-1.16 g/cm3 , and the average value was 1.08 g/cm3 . The hydrostatic settling velocity was 2.32-12.92 cm/s. CONCLUSIONS: The eco-hydraulics characteristics of B...
May 18, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29469525/-comparison-of-three-different-methods-for-isolating-rna-from-oncomelania-hupensis
#17
Xu Shu-Jun, Wang Kang, Zhang Min-Hong, Chen Wen-Jie, Guan Guo-Yu, Liu Man-Man, Xu Lei, Sun En-Tao
OBJECTIVE: To compare the effects of three kinds of Oncomelania hupensis RNA extraction methods, namely a modified SDS method, TRIzol reagent method, and CTAB method, so as to obtain an economical and efficient method for RNA extraction from O. hupensis . METHODS: The modified SDS method, TRIzol reagent method and CTAB method were applied to extract the RNA from O. hupensis . A nucleic acid protein analyzer was used to measure the concentration and purity of RNA...
May 22, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29469517/-distribution-features-of-wild-feces-in-schistosomiasis-endemic-areas-in-jiangling-county-hubei-province
#18
Zhang Xia, Xue Jing-Bo, Hu He-Hua, Liu Xiong, Cui Cai-Xia, Wen Xiao-Hong, Xie Xiao-Ping, Zhang Wei-Rong, Tian Rong, Dong Li-Chun, Cao Chun-Li, Li Shi-Zhu, Zhou Yi-Biao
OBJECTIVE: To understand the spatial distribution characteristics of wild feces in schistosomiasis endemic areas of Jiangling County, Hubei Province and further explore the source of infection efficiently, so as to provide the evidence for the development of corresponding monitoring and response technology. METHODS: In 2011, the fresh wild feces were investigated every two months in the selected 15 villages by the severity of historical endemic in Jiangling County...
March 7, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29469513/-surveillance-of-schistosomiasis-in-people-s-republic-of-china-in-2015
#19
Dang Hui, Jin Jia-Ning, Xu Jing, Li Shi-Zhu, Zhou Xiao-Nong, Sun Jun-Ling, Li Zhong-Jie, Lv Shan
OBJECTIVE: To analyze the investigation data of the national schistosomiasis surveillance sites in 2015, so as to provide scientific evidences for schistosomiasis control, elimination and surveillance. METHODS: According to National Schistosomiasis Surveillance Programme (version 2014), 457 surveillance sites were selected, and the investigation data in residents, floating population, domestic animals and Oncomelania hupensis snails were collected and analyzed from four types of endemic counties...
June 12, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29469510/-challenges-and-countermeasures-for-water-conservancy-combined-with-schistosomiasis-prevention-and-control-in-china-in-new-era
#20
Wang Jia-Sheng, Lu Jin-You, Min Feng-Yang, Zhu Kong-Xian
The spread of schistosomiasis seriously threaten the health of people and hinder the economic and social development in China. The water conservancy combined with schistosomiasis prevention and control effectively controlled the spread of schistosomiasis by controlling the spread of Oncomelania hupensis , the only intermediate host of Schistosoma japonicum . This paper reviews the evolution of the strategy of schistosomiasis prevention and control in China and points out the historical role of water conservancy combined with schistosomiasis prevention and control...
April 27, 2017: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
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