oncomelania quadrasi intermediate host

These two studies have enhanced our understanding of the spatial distribution of O. hupensis, and hence S. japonicum transmission, at the meso-scale, that is the level generally used for the targeting of control interventions. A genus Tricula aperta from the subfamily Triculinae transmits S. mekongi. Remigio Olveda, ... Xiao-Nong Zhou, in Advances in Parasitology, 2010, It is now feasible to predict the distribution of the intermediate schistosomiasis host snail with the aid of remotely sensed environmental data (Guo et al., 2005b; Yang et al., 2005; Zhou et al., 2001). While Guo et al. Rats were recommended to be good sentinel animals in this environment. These interventions have been adopted as a national strategy to control schistosomiasis in P.R. Conditioned medium is passed through 0.22-µm filters and either used immediately or stored at 4°C for up to 1 week. Later, Saijuntha et al. Distinct Genetic Diversity of Oncomelania hupensis, Intermediate Host of Schistosoma japonicum in … (2014) pointed out that the phylogenetic tree and the haplotype network indicate that O. hupensis fragmented into O. h. hupensis, O. h. formosana and O. h. chiui and O. h. quadrasi, though the time when this ocurred was not discussed. It is an aquatic snail species that prefers fast-flowing freshwater. they have no cover or lid on the shells. View Article Google Scholar 36. Cultivation of cercariae of S. mansoni to the adult flukes has been described.196 The cercariae can be transformed into schistosomula by incubating in NCTC 109 medium supplemented with 50% human or rabbit serum. Comparative Phylogenetic Studies on Schistosoma japonicum and Its Snail Intermediate Host Oncomelania hupensis: Origins, Dispersal and Coevolution. (2) Test whether a disease is randomly distributed over space, over time or over space and time. Trematodes belonging to the genus Schistosoma cause schistosomiasis. a. Hymenolepis nana … Typical projects make use of one or more of the following techniques: neural networks, linear analysis, genetic algorithms, genetic programming, genetic optimization, pattern recognition, data fusion, data mining, web bots and autonomous agents. Background. (4) Perform repeated time-periodic disease surveillance for early detection of disease outbreaks. Med. Agreement was reached on the use of compatible GIS formats, software, methods and data resources, including the creation of a ‘minimum medical database’ to enable seamless incorporation of results from each regional GIS project into a global spatial decision support systems model. Introduction. 2014;90(6):1140–5. Saijuntha, W. et al. The population dynamics of the snails, and consequently the transmission dynamics of the parasite populations, may differ greatly from one area, one season or one year to another. Results of the analysis show that in the three regions of Luzon, Visayas and Mindanao, males and individuals aged 20 years had significantly higher prevalence of S. japonicum compared with females and children < 5 years. Bge cell preparation: Bge cells are cultured in a previously described medium formulation with the addition of phenol red (0.2%) as pH indicator. Digital vector files for GIS analysis collected include data on political boundaries (county, provinces and country), environmental features (drainage, land cover and soil type), population and climate. Landsat), were developed as case study examples, and relevant environmental factors related to schistosomiasis were mapped, to test and verify the usefulness of the database. The infective dynamics of the intermediate host are such that usually less than 0.5% is infected with schistosomes at any one time. Read "Molecular Phylogeography of Oncomelania Lindoensis (Gastropoda: Pomatiopsidae), the Intermediate Host of Schistosoma Japonicum in Sulawesi, Journal of Molluscan Studies" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Determination of the infective potential of sporocysts grown in vitro: Naive B. glabrata, M-line, are prepared for surgery by cleaning the shell with 70% ethanol, holding in a 2% aqueous antibiotic/antimycotic bath for 45 min, and again wiping with 70% ethanol. Media are replaced at the intervals of 2–7 days. (2008) in the same endemic province of Leyte, showed that density of the intermediate snail host in the Philippines, Oncomelania hupensis quadrasi, was remarkably uniform across habitats such as streams, springs, canals and swampy areas and without significant differences between rain-fed and irrigated villages, though the prevalence of infected snails … (2005) also derived brightness and greenness. The amphibious Oncomelania intermediate host of S. japonicum spends part of its time out of water, preferring moist soil in marshy habitats, at the edge of slow-flowing streams, or irrigation canals. Intermediate host definition is - a host which is normally used by a parasite in the course of its life cycle and in which it may multiply asexually but not sexually. In a cross-sectional study of the prevalence of intensity of infection with S. japonicum in 50 irrigated and rain-fed villages in Samar Province, the Philippines, Tarafder et al. Long-term continuously proliferative cultures of S. mansoni sporocysts have been developed. Water contact was studied in detail in a five-year project, where Payne et al. Although final proof of the presence of infected snails requires microscopy, this research group could confirm that snail densities in the marshlands relate to vegetation, wetness and temperature. All Rights Reserved, {{ $t("message.AD_EXPIRE_DATE") }}{{ad01_expire_date}}, Japanese Journal of Experimental Medicine, {{ $t("message.AD_EXPIRE_DATE") }}{{ad02_expire_date}}, {{ $t("message.AD_EXPIRE_DATE") }}{{ad03_expire_date}}. Stirred, not shaken: genetic structure of the intermediate snail host Oncomelania hupensis robertsoni in an historically endemic schistosomiasis area Anne-Kathrin Hauswald , J. Remais , +4 authors T. Wilke However, there is now ample evidence that it is feasible to predict the snail distribution with the aid of remotely sensed environmental data (Malone, 2005; Yang et al., 2005; Zhou et al., 2001). Infections of rodents (same gender, 3–4 weeks old, weighing 18–25 g) with S. mansoni are commonly initiated by SC injection of 100–150 cercariae (infective larvae). The cells are passaged by treating with 0.02% trypsin in Chernin’s balanced salt solution for 5 min. A closer collaboration between groups such as RNAS+, the Global network for Geospatial Health and the Global Spatial Data Infrastructure Association (www.gisd.org) can play a central role in promoting the routine use of geospatial models in health decision-making processes (Zhou et al., 2002). The villages were classified as rain-fed (25) or with some man-made irrigation system (25). For example, Chen et al. (2007) pioneered this approach creating time–activity maps which indicated that people are surprisingly mobile, averaging 1.4 ± 1.2 water-contacts per day. Ibid., 45: 259-273. Marti , H. ( 1986 ). Carabin et al. (2005) applied spatial analysis based on satellite imagery to predict the distribution of O. hupensis at the meso- and even at the micro-level. Furthermore, genetic differences between some S. japonicum isolates in the Philippines were shown to be genetically differentiated from the Leyte and Luzon populations, while the genetic structure of O. h. quadrasi populations from Leyte, Oriental Mindoro and Cagayan are significantly separated genetically. Free fulltext PDF articles from hundreds of disciplines, all in one place Sch. A SURVEY ON THE HABITAT OF ONCOMELANIA SNAILS, THE INTERMEDIATE HOST OF SCHISTOSOMA JAPONICUM IN THE PHILLIPINES AND FORMOSA 小宮 義孝 Japanese Journal of Medical Science and Biology 17(4), 195-210, 1964 Assessment of individual exposure to schistosomiasis is often part of such studies which are challenging even at the household level. Schistosomiasis is an endemic disease in the Philippines caused by Schistosoma japonica which was usually associated with its host, Oncomelania quadrasi, a freshwater mollusk. Experimental infection of Oncomelania quadrasi, the molluscan intermediate host of Schistosoma japonicum. After 16–20 h in sterile artificial spring water, surviving snails are placed in larger aquaria for long-term culture. Each intermediate host snail is exposed to ~10 miracidia. Irrigated villages were found to be 1.4 times more likely to have schistosomiasis than rain-fed villages. Which of the following tapeworms has an unarmed scolex? The intensity profiles were very different in children less than 7 years old compared with older children and adults. Among four distribution models examined, three uneven distribution models, i.e., the double Poisson, Neyman type A and negative binomial fitted well in this order but the Poisson model showed the … Med. Use of quantitative GIS, WebGIS and emerging satellite information are new technologies that hold promise for enhanced infection risk mapping and disease prediction. (2014) revealed significant spatial variation in S. japonicum infection risk, suggesting that spatially targeted interventions like mass drug administration (MDA) could result in efficiency gains for schistosomiasis control in the Philippines. MCMULLEN, D. B., KOMIYAMA, S. and ENDO-ITABASHI, T. 1951. The cultures are maintained in sporocyst medium, either fresh or conditioned for 16–20 h on exponentially growing Bge cells or on synxenic cocultures. (2005b) developed a useful model to predict snail habitats. Coculture preparation and maintenance: Cocultures are maintained at 26°C in sporocyst medium, a mixture of Medium F, DMEM/F12, and Bge medium (1:1:2) with the addition of 5% Serum Plus, 5% FBS, 0.001% 2-mercaptoethanol, 0.05% chemically defined lipid concentrate, and 20 µg/mL gentamicin. For the initiation of in vitro cultures the miracidia are transformed into primary (mother) sporocysts (the first intramolluscan stage) by overnight culture in Medium F containing 20 µg/mL gentamicin and 1% bovine albumin. III. Prevalence of Schistosoma japonicum infection of Oncomelania quadrasi snail colonies in 50 irrigated and rain-fed villages of Samar Province, the Philippines Satellite images in the database include normalized difference vegetation index (NDVI) images from advanced very high resolution radiometer (AVHRR), land surface temperature (LST) images from AVHRR, GTOPO30 Digital Elevation Model (DEM) images from USGS and land use images from USGS. described a comprehensive control strategy to control transmission of S. japonicum in P.R. (2006) attribute the persistence of schistosomiasis in many endemic areas in the Philippines despite strong implementation of control programmes to the association with infected dogs and cats. The Control of Schistosomiasis japonica: I. Observations on the habits, ecology and life cycle of Oncomelania quadrasi, the molluscan intermediate host of Schistosoma japonicum in the Philippine Islands. In vitro culture from schistosomula to adult worms has been successful, but although the reproductive organs formed in the worms paired, the eggs laid were sterile. (2006) used three tools in determining the frequency of water contact in four schistosomiasis endemic villages in the Philippines: (i) bimonth interviews; (ii) self-administered diaries; and (iii) field observations. By using an elongated silane-treated Pasteur pipette, established cocultures containing about three sporocysts are deposited below the mantle tissue, avoiding puncture of the digestive gland. The sporocysts from long-term cultures successfully parasitized snails and spontaneously produced the cercariae in vitro at low frequency. Based on satellite-derived data, Guo et al. Disinfesting Oncomelania hupensis, Japan has completely overcome Schistosoma japonicum. One of the main outputs was the ‘Asia Minimum Medical GIS Database’ (MMDb) in collaboration with the Regional Network on Asian Schisosomiamiasis and Other Important Zoonotic Helminthes (RNAS+, www.rnas.org.cn), in which spatial data collected from public domain sources was compiled and standardized in decimal degree format, including (1) satellite images covering areas of Asia; (2) digital maps of Asia in vector files and (3) diseases databases and relevant models. McMullen DB. 15–30 m2, Landsat ETM+) or habitat scale analysis (e.g. Med., Showa-ku, Nagoya 466, About Japanese Journal of Experimental Medicine, Copyright (c) 2009 Japan Science and Technology Agency. John B. Malone, ... Xiao-Nong Zhou, in Advances in Parasitology, 2010. Eggs. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. URL: https://www.sciencedirect.com/science/article/pii/B9780702051012000534, URL: https://www.sciencedirect.com/science/article/pii/S0065308X10720054, URL: https://www.sciencedirect.com/science/article/pii/S0065308X10720030, URL: https://www.sciencedirect.com/science/article/pii/B9781416043904001223, URL: https://www.sciencedirect.com/science/article/pii/B9780128165775000065, URL: https://www.sciencedirect.com/science/article/pii/S0065308X1930034X, URL: https://www.sciencedirect.com/science/article/pii/S0065308X10730049, Manson's Tropical Infectious Diseases (Twenty-third Edition), Important Helminth Infections in Southeast Asia: Diversity and Potential for Control and Elimination, Part A, Malone, 2005; Yang et al., 2005; Zhou et al., 2001, Guo et al., 2005b; Yang et al., 2005; Zhou et al., 2001, Chen et al., 2007; Leonardo et al., 2007; Li et al., 2009; Malone et al., 2010; Wu et al., 2007; Yang et al., 2006; Zhou et al., 2004, 2008c, Hunter's Tropical Medicine and Emerging Infectious Disease (Ninth Edition), Ivan G. Horak DVSc, Professor, ... Dawie J. Kok DSc, in, Regional Network for Asian Schistosomiasis and Other Helminthic Zoonoses, Important Helminth Infections in Southeast Asia: Diversity and Potential for Control and Elimination, Part B, http://www.mrc-bsu.cam.ac.uk/bugs/welcome.sh, http://earthobservatory.nasa.gov/Features/Chameleons/chameleons3.php, Doenhoff et al., 2004; Ross, et al., 2001; Wu, 2002. This study aimed to know the presence of S. japonica associated with O. Other investigations employing GIS and RS technology have focused on control strategy formulation after a long period of research in developing tools in the laboratory. The Oncomelania shell differs markedly in size and shape from those of the aquatic snails and Oncomelania snails have very different biological characteristics. Neural Solutions: Neural Solutions is a U.K. consultancy specializing in research, development and deployment of Artificial Intelligence and Electronic Commerce solutions, with a particular emphasis on Dynamic Pricing and the building of information-searching robots that trawl the Internet. China. China. Additional GIS applications on Asian schistosomiasis in P.R. The outcome suggested that using data from ELISA alone or both ELISA and Kato-Katz tests resulted in similar prevalence estimates. The strategy includes elimination of environmental contamination of snail habitats by bovines as well as humans as central components of the comprehensive control strategy. The One Health approach, involving experts in environmental sciences, veterinary and human medicine, could possibly contribute to the elimination of schistosomiasis in human communities. The approach of predicting the spatial distribution of human prevalence of S. japonicum infection supported by spatial analysis was useful for formulation of strategies for schistosomiasis control in different environment settings at the county level. A cross-sectional survey of Oncomelania quadrasi, the intermediate host for Schistosoma japonicum, was conducted between 2004 and 2005 in 50 villages of the Province of Samar, the Philippines. 0.6–4 m2, QuickBird). Observations on the habits, ecology, and life cycle of Oncomelania nosophora, the molluscan intermediate host of Background: The perpetuation of schistosomiasis japonica in the Philippines depends to a major extent on the persistence of its intermediate host Oncomelania hupensis quadrasi, an amphibious snail. However, the accuracy can be perfected with only a fraction of the normal workload if the study subjects are equipped with global positioning system (GPS) receivers to record their water-contact patterns. It is designed for any of the following interrelated purposes: (1) Perform geographical surveillance of disease, to detect spatial or space–time disease clusters, and to see if they are statistically significant. The molluscanintermediate host and schistosomiasis japonica. Population Studies on Oncomelania quadrasi,the Snail Intermediate Host of Schistosoma japonicum,in the Philippines-4-Evaluation of Drainage for Snail Control 2 アカイエカ群各系統間判別のための推計学的方法(アカイエカ群の諸問題) The study of Magalhães et al. Am J Epidemiol. Paperity: the 1st multidisciplinary aggregator of Open Access journals & papers. American Journal of Tropical Medicine and Hygiene 27, 597 – 602. Data on diseases were mainly generated from survey or case reports. Traditionally, snail densities and infection rates are calculated after collection of the intermediate snail host Oncomelania hupensis on site. This finding is backed up by Fernandez et al. Am J Trop Med Hyg. Med. Both synxenic (mixed) and membrane-separated culture systems were successfully initiated. Lydia Leonardo, ... Xiao-Nong Zhou, in Advances in Parasitology, 2019. Access JDreamⅢ for advanced search and analysis. Zhang et al. III. This finding in addition to the significant village to village variation in prevalence could possibly suggest different transmission dynamics in the Philippine compared to PR China. The software may also be used for similar problems in other fields such as archaeology, astronomy, botany, criminology, ecology, economics, engineering, forestry, genetics, geography, geology, history, neurology or zoology (http://www.satscan.org/). It was found that schistosomiasis is mainly distributed along the marshlands along the Yangtze River, and a positive correlation (Spearman correlation coefficient) that decreased over time was shown to exist between the infection prevalence in humans and in bovines.

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