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Tabo Z, Kalinda C, Breuer L, Albrecht C. Exploring the interplay between climate change and schistosomiasis transmission dynamics. Infect Dis Model 2024; 9:158-176. [PMID: 38268699 PMCID: PMC10805680 DOI: 10.1016/j.idm.2023.12.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Revised: 11/07/2023] [Accepted: 12/16/2023] [Indexed: 01/26/2024] Open
Abstract
Schistosomiasis, a neglected tropical disease caused by parasitic worms, poses a major public health challenge in economically disadvantaged regions, especially in Sub-Saharan Africa. Climate factors, such as temperature and rainfall patterns, play a crucial role in the transmission dynamics of the disease. This study presents a deterministic model that aims to evaluate the temporal and seasonal transmission dynamics of schistosomiasis by examining the influence of temperature and rainfall over time. Equilibrium states are examined to ascertain their existence and stability employing the center manifold theory, while the basic reproduction number is calculated using the next-generation technique. To validate the model's applicability, demographic and climatological data from Uganda, Kenya, and Tanzania, which are endemic East African countries situated in the tropical region, are utilized as a case study region. The findings of this study provide evidence that the transmission of schistosomiasis in human populations is significantly influenced by seasonal and monthly variations, with incidence rates varying across countries depending on the frequency of temperature and rainfall. Consequently, the region is marked by both schistosomiasis emergencies and re-emergences. Specifically, it is observed that monthly mean temperatures within the range of 22-27 °C create favorable conditions for the development of schistosomiasis and have a positive impact on the reproduction numbers. On the other hand, monthly maximum temperatures ranging from 27 to 33 °C have an adverse effect on transmission. Furthermore, through sensitivity analysis, it is projected that by the year 2050, factors such as the recruitment rate of snails, the presence of parasite egg-containing stools, and the rate of miracidia shedding per parasite egg will contribute significantly to the occurrence and control of schistosomiasis infections. This study highlights the significant influence of seasonal and monthly variations, driven by temperature and rainfall patterns, on the transmission dynamics of schistosomiasis. These findings underscore the importance of considering climate factors in the control and prevention strategies of schistosomiasis. Additionally, the projected impact of various factors on schistosomiasis infections by 2050 emphasizes the need for proactive measures to mitigate the disease's impact on vulnerable populations. Overall, this research provides valuable insights to anticipate future challenges and devise adaptive measures to address schistosomiasis transmission patterns.
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Affiliation(s)
- Zadoki Tabo
- Department of Animal Ecology and Systematics, Justus Liebig University Giessen, Heinrich-Buff-Ring 26 (iFZ), 35392 Giessen, Germany
- Department of Landscape Ecology and Resource Management, Justus Liebig University Giessen, Heinrich-Buff-Ring 26 (iFZ), 35392 Giessen, Germany
| | - Chester Kalinda
- Department of Animal Ecology and Systematics, Justus Liebig University Giessen, Heinrich-Buff-Ring 26 (iFZ), 35392 Giessen, Germany
- Bill and Joyce Cummings Institute of Global Health, University of Global Health Equity | Kigali Heights, Plot 772 KG 7 Ave. PO Box 6955, Kigali, Rwanda
| | - Lutz Breuer
- Department of Landscape Ecology and Resource Management, Justus Liebig University Giessen, Heinrich-Buff-Ring 26 (iFZ), 35392 Giessen, Germany
- Centre for International Development and Environmental Research (ZEU), Justus Liebig University Giessen, Senckenbergstrasse 3, 35390 Giessen, Germany
| | - Christian Albrecht
- Department of Animal Ecology and Systematics, Justus Liebig University Giessen, Heinrich-Buff-Ring 26 (iFZ), 35392 Giessen, Germany
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Mwai J, Omogi JO, Abdi MH. Environmental factors influencing Prevention and Control of Schistosomiasis Infection in Mwea, Kirinyaga County Kenya: A cross sectional study. East Afr Health Res J 2021; 5:99-105. [PMID: 34308251 PMCID: PMC8291202 DOI: 10.24248/eahrj.v5i1.657] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 05/06/2021] [Indexed: 11/20/2022] Open
Abstract
Background Schistosomiasis remains a major public health problem in Kenya. Environmental factors are critical in creating a medium for growth and spread of schistosomiasis vectors. The study investigated the environmental factors influencing prevention and control of schistosomiasis infection in Mwea West Sub County, Kirinyaga County-Kenya. Methods A multi stage sampling was used to identify four hundred and sixty-five (465) household. Analytical descriptive cross-sectional design that utilised quantitative data collection method was used. Data was collected using a pretested structured questionnaire and analysed using Chi square tests or Fisher's exact tests where applicable. Results Study results indicated a significant association p<.001 between household level of education, members being affected by floods during the rainy season and schistosomiasis infection. The result further indicates level of significance (p<0.047) in the association between sources of water in a household and schistosomiasis infection. No level of significance was posted between having a temporary water body in the area p (=.072) and schistosomiasis infection. In addition, there was no significant association between proximity to the nearest water source, p=.074 and proximity to the nearest health facility p=0.356 with schistosomiasis infection. Conclusions The study recommends carefully designing safe water sources in order to match the goal of effectively controlling and reversing the trends of schistosomiasis infections. The community should be made aware of the risk factors of schistosomiasis including water utilised in the household's alongside raising health seeking behaviours for diagnosis and treatment of schistosomiasis as a way of reducing the spread of infection.
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Xiao G, Li X, Jiang H, Peng Z, Liu W, Lu Q. Analysis of risk factors and changing trends the infection rate of intestinal schistosomiasis caused by S. japonicum from 2005 to 2014 in Lushan city. Parasitol Int 2018; 67:751-758. [PMID: 30055333 DOI: 10.1016/j.parint.2018.07.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 06/22/2018] [Accepted: 07/22/2018] [Indexed: 11/24/2022]
Abstract
Intestinal schistosomiasis caused by S. japonicum has long been a threat to the health of residents within endemic areas, especially along the mid-tier of the Yangtze River basin as well as the Dongting and Poyang lakes. Therefore, we collected monitoring data from 2005 to 2014 in Lushan City, Jiujiang City, Jiangxi Province, which is located downstream of Poyang Lake. We conducted a logistic regression analysis in 2005 and in 2008 and then conducted a time series analysis from 2005 to 2014 in Lushan city. The results of the logistic regression analysis showed that after integrated measures were implemented in Lushan city in 2004, the infection rate of intestinal schistosomiasis decreased sharply in different populations, but fishermen had a greater risk of contracting intestinal schistosomiasis in both 2005 and 2008. From the time series analysis, we found that the infection rate decreased sharply from 2005 to 2009 and then increased slowly from 2009 to 2011 before finally becoming relatively stable and the predicated infection rates in HES, SM2, and SM3 are -1.14%, 0.35%, 0.29%, respectively, compared with 0.41% of schistosomiasis infection in 2014, showing a downward trend. Our study indicated that the integrated measures initiated in 2004 in Lushan city had a positive effect on controlling intestinal schistosomiasis, but we should still emphasize special treatment of particular populations, such as fishermen, and should consider environmental changes, such as changes in the water level of Poyang Lake, in the future.
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Affiliation(s)
- Guoliang Xiao
- Department of Biostatistics and Epidemiology, School of Public Health, Nanchang University, Nanchang 330006, PR China
| | - Xinghuo Li
- Xingzi County Station of Schistosomiasis Control, Jiujiang, Jiangxi 330006, PR China
| | - Hongyin Jiang
- Department of Biostatistics and Epidemiology, School of Public Health, Nanchang University, Nanchang 330006, PR China
| | - Zhanghua Peng
- Xingzi County Station of Schistosomiasis Control, Jiujiang, Jiangxi 330006, PR China
| | - Wei Liu
- Xingzi County Station of Schistosomiasis Control, Jiujiang, Jiangxi 330006, PR China
| | - Quqin Lu
- Department of Biostatistics and Epidemiology, School of Public Health, Nanchang University, Nanchang 330006, PR China; Jiangxi Provincial Key Laboratory of Preventive Medicine, Nanchang University, Nanchang 330006, PR China.
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Yang Y, Zheng SB, Yang Y, Cheng WT, Pan X, Dai QQ, Chen Y, Zhu L, Jiang QW, Zhou YB. The Three Gorges Dam: Does the Flooding Time Determine the Distribution of Schistosome-Transmitting Snails in the Middle and Lower Reaches of the Yangtze River, China? INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2018; 15:E1304. [PMID: 29933638 PMCID: PMC6069228 DOI: 10.3390/ijerph15071304] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 06/17/2018] [Accepted: 06/18/2018] [Indexed: 11/16/2022]
Abstract
BACKGROUND Schistosomiasis is one of the most devastating tropical diseases in the world. Oncomelania hupensis is the only intermediate host of Schistosoma japonicum, and its growth and development are sensitive to environmental factors. The Three Gorges Dam has substantially altered the water level in the Yangtze River. This study focused on the impact of the flooding time on the occurrence of Oncomelania snails in Hunan Province, China. METHODS The data regarding Oncomelania snails were collected from the Schistosomiasis Atlas of the People's Republic of China. Air temperature, hours of daylight and relative humidity from 1995 to 2002 were collected from the China Meteorological Data Sharing Service System. The data for rainfall and days inundated with water were collected from the Hunan flood control information system and hydrological stations in Hunan Province. A generalized additive model was used to estimate the impact of these factors on the presence or absence of snails. RESULTS The number of days inundated with water in the areas with snails ranged from 56 to 212 days. However, 82 percent of the areas without snails were inundated with water less than 60 days. The lowest air temperature in a year in the areas without snails ranges from -2.88 °C to -2.10 °C, and the range was from -2.88 °C to -2.34 °C for areas with snails. Annual rainfall in the areas with snails ranged from 989 to 1565 mm, and the range was from 1230 mm to 1647 mm for the areas without snails. The results from the generalized additive model showed that the number of days inundated with water, lowest air temperature in a year, annual rainfall, days of daily rainfall greater than 0.1 mm, and hours of daylight were the factors that significantly affect the occurrence of snails in Hunan Province, China. CONCLUSIONS The number of days inundated with water may be a key factor determining the geographical distribution of Oncomelania snails in Hunan Province and the favorable number of days inundated with water for the survival of snails ranges from about 2 to 7 months.
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Affiliation(s)
- Yu Yang
- Fudan University School of Public Health, Building 8, 130 Dong'an Road, Xuhui District, Shanghai 200032, China.
- Key Laboratory of Public Health Safety, Fudan University, Ministry of Education, Building 8, 130 Dong An Road, Xuhui District, Shanghai 200032, China.
- Fudan University Center for Tropical Disease Research, Building 8, 130 Dong'an Road, Xuhui District, Shanghai 200032, China.
| | - Sheng-Bang Zheng
- Fudan University School of Public Health, Building 8, 130 Dong'an Road, Xuhui District, Shanghai 200032, China.
- Key Laboratory of Public Health Safety, Fudan University, Ministry of Education, Building 8, 130 Dong An Road, Xuhui District, Shanghai 200032, China.
- Fudan University Center for Tropical Disease Research, Building 8, 130 Dong'an Road, Xuhui District, Shanghai 200032, China.
| | - Ya Yang
- Fudan University School of Public Health, Building 8, 130 Dong'an Road, Xuhui District, Shanghai 200032, China.
- Key Laboratory of Public Health Safety, Fudan University, Ministry of Education, Building 8, 130 Dong An Road, Xuhui District, Shanghai 200032, China.
- Fudan University Center for Tropical Disease Research, Building 8, 130 Dong'an Road, Xuhui District, Shanghai 200032, China.
| | - Wan-Ting Cheng
- Fudan University School of Public Health, Building 8, 130 Dong'an Road, Xuhui District, Shanghai 200032, China.
- Key Laboratory of Public Health Safety, Fudan University, Ministry of Education, Building 8, 130 Dong An Road, Xuhui District, Shanghai 200032, China.
- Fudan University Center for Tropical Disease Research, Building 8, 130 Dong'an Road, Xuhui District, Shanghai 200032, China.
| | - Xiang Pan
- Fudan University School of Public Health, Building 8, 130 Dong'an Road, Xuhui District, Shanghai 200032, China.
- Key Laboratory of Public Health Safety, Fudan University, Ministry of Education, Building 8, 130 Dong An Road, Xuhui District, Shanghai 200032, China.
- Fudan University Center for Tropical Disease Research, Building 8, 130 Dong'an Road, Xuhui District, Shanghai 200032, China.
| | - Qing-Qing Dai
- Department of Statistics, Oklahoma State University, Stillwater, WA 74078, USA.
| | - Yue Chen
- School of Epidemiology and Public Health, Faculty of Medicine, University of Ottawa, 600 Peter Morand Crescent, Ottawa, ON K1G 5Z3, Canada.
| | - Lan Zhu
- Department of Statistics, Oklahoma State University, Stillwater, WA 74078, USA.
| | - Qing-Wu Jiang
- Fudan University School of Public Health, Building 8, 130 Dong'an Road, Xuhui District, Shanghai 200032, China.
- Key Laboratory of Public Health Safety, Fudan University, Ministry of Education, Building 8, 130 Dong An Road, Xuhui District, Shanghai 200032, China.
- Fudan University Center for Tropical Disease Research, Building 8, 130 Dong'an Road, Xuhui District, Shanghai 200032, China.
| | - Yi-Biao Zhou
- Fudan University School of Public Health, Building 8, 130 Dong'an Road, Xuhui District, Shanghai 200032, China.
- Key Laboratory of Public Health Safety, Fudan University, Ministry of Education, Building 8, 130 Dong An Road, Xuhui District, Shanghai 200032, China.
- Fudan University Center for Tropical Disease Research, Building 8, 130 Dong'an Road, Xuhui District, Shanghai 200032, China.
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Head JR, Chang H, Li Q, Hoover CM, Wilke T, Clewing C, Carlton EJ, Liang S, Lu D, Zhong B, Remais JV. Genetic Evidence of Contemporary Dispersal of the Intermediate Snail Host of Schistosoma japonicum: Movement of an NTD Host Is Facilitated by Land Use and Landscape Connectivity. PLoS Negl Trop Dis 2016; 10:e0005151. [PMID: 27977674 PMCID: PMC5157946 DOI: 10.1371/journal.pntd.0005151] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Accepted: 11/01/2016] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND While the dispersal of hosts and vectors-through active or passive movement-is known to facilitate the spread and re-emergence of certain infectious diseases, little is known about the movement ecology of Oncomelania spp., intermediate snail host of the parasite Schistosoma japonicum, and its consequences for the spread of schistosomiasis in East and Southeast Asia. In China, despite intense control programs aimed at preventing schistosomiasis transmission, there is evidence in recent years of re-emergence and persistence of infection in some areas, as well as an increase in the spatial extent of the snail host. A quantitative understanding of the dispersal characteristics of the intermediate host can provide new insights into the spatial dynamics of transmission, and can assist public health officials in limiting the geographic spread of infection. METHODOLOGY/PRINCIPAL FINDINGS Oncomelania hupensis robertsoni snails (n = 833) were sampled from 29 sites in Sichuan, China, genotyped, and analyzed using Bayesian assignment to estimate the rate of recent snail migration across sites. Landscape connectivity between each site pair was estimated using the geographic distance distributions derived from nine environmental models: Euclidean, topography, incline, wetness, land use, watershed, stream use, streams and channels, and stream velocity. Among sites, 14.4% to 32.8% of sampled snails were identified as recent migrants, with 20 sites comprising >20% migrants. Migration rates were generally low between sites, but at 8 sites, over 10% of the overall host population originated from one proximal site. Greater landscape connectivity was significantly associated with increased odds of migration, with the minimum path distance (as opposed to median or first quartile) emerging as the strongest predictor across all environmental models. Models accounting for land use explained the largest proportion of the variance in migration rates between sites. A greater number of irrigation channels leading into a site was associated with an increase in the site's propensity to both attract and retain snails. CONCLUSIONS/SIGNIFICANCE Our findings have important implications for controlling the geographic spread of schistosomiasis in China, through improved understanding of the dispersal capacity of the parasite's intermediate host.
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Affiliation(s)
- Jennifer R. Head
- Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, Georgia, United States of America
| | - Howard Chang
- Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, Georgia, United States of America
| | - Qunna Li
- Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, Georgia, United States of America
| | - Christopher M. Hoover
- Environmental Health Sciences, School of Public Health, University of California, Berkeley, California, United States of America
| | - Thomas Wilke
- Department of Animal Ecology and Systematics, Justus Liebig University, Giessen, Germany
| | - Catharina Clewing
- Department of Animal Ecology and Systematics, Justus Liebig University, Giessen, Germany
| | - Elizabeth J. Carlton
- Department of Environmental and Occupational Health, Colorado School of Public Health, University of Colorado, Anschutz, Aurora, Colorado, United States of America
| | - Song Liang
- Department of Environmental & Global Health, College of Public Health and Health Professions, University of Florida, Gainesville, Florida, United States of America
| | - Ding Lu
- Institute of Parasitic Diseases, Sichuan Center for Disease Control and Prevention, Chengdu, China
| | - Bo Zhong
- Institute of Parasitic Diseases, Sichuan Center for Disease Control and Prevention, Chengdu, China
| | - Justin V. Remais
- Environmental Health Sciences, School of Public Health, University of California, Berkeley, California, United States of America
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6
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Zhang Z, Manjourides J, Cohen T, Hu Y, Jiang Q. Spatial measurement errors in the field of spatial epidemiology. Int J Health Geogr 2016; 15:21. [PMID: 27368370 PMCID: PMC4930612 DOI: 10.1186/s12942-016-0049-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Accepted: 06/15/2016] [Indexed: 11/29/2022] Open
Abstract
Background Spatial epidemiology has been aided by advances in geographic information systems, remote sensing, global positioning systems and the development of new statistical methodologies specifically designed for such data. Given the growing popularity of these studies, we sought to review and analyze the types of spatial measurement errors commonly encountered during spatial epidemiological analysis of spatial data.
Methods Google Scholar, Medline, and Scopus databases were searched using a broad set of terms for papers indexed by a term indicating location (space or geography or location or position) and measurement error (measurement error or measurement inaccuracy or misclassification or uncertainty): we reviewed all papers appearing before December 20, 2014. These papers and their citations were reviewed to identify the relevance to our review. Results We were able to define and classify spatial measurement errors into four groups: (1) pure spatial location measurement errors, including both non-instrumental errors (multiple addresses, geocoding errors, outcome aggregations, and covariate aggregation) and instrumental errors; (2) location-based outcome measurement error (purely outcome measurement errors and missing outcome measurements); (3) location-based covariate measurement errors (address proxies); and (4) Covariate-Outcome spatial misaligned measurement errors. We propose how these four classes of errors can be unified within an integrated theoretical model and possible solutions were discussed. Conclusion Spatial measurement errors are ubiquitous threat to the validity of spatial epidemiological studies. We propose a systematic framework for understanding the various mechanisms which generate spatial measurement errors and present practical examples of such errors.
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Affiliation(s)
- Zhijie Zhang
- Department of Epidemiology and Biostatistics, School of Public Health, Fudan University, Shanghai, 200032, China. .,Key Laboratory of Public Health Safety, Ministry of Education, Shanghai, 200032, China.
| | - Justin Manjourides
- Department of Health Sciences, Northeastern University, Boston, MA, 02115, USA
| | - Ted Cohen
- Department of Epidemiology and the Center for Communicable Disease Dynamics, School of Public Health, Harvard University, Boston, MA, 02115, USA.,Division of Global Health Equity, Brigham and Women's Hospital, Boston, MA, 02115, USA.,Harvard Medical School, Boston, MA, 02115, USA
| | - Yi Hu
- Department of Epidemiology and Biostatistics, School of Public Health, Fudan University, Shanghai, 200032, China.,Key Laboratory of Public Health Safety, Ministry of Education, Shanghai, 200032, China
| | - Qingwu Jiang
- Department of Epidemiology and Biostatistics, School of Public Health, Fudan University, Shanghai, 200032, China.,Key Laboratory of Public Health Safety, Ministry of Education, Shanghai, 200032, China
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Di Lellis MA, Sereda S, Geißler A, Picot A, Arnold P, Lang S, Troschinski S, Dieterich A, Hauffe T, Capowiez Y, Mazzia C, Knigge T, Monsinjon T, Krais S, Wilke T, Triebskorn R, Köhler HR. Phenotypic diversity, population structure and stress protein-based capacitoring in populations of Xeropicta derbentina, a heat-tolerant land snail species. Cell Stress Chaperones 2014; 19:791-800. [PMID: 24609822 PMCID: PMC4389839 DOI: 10.1007/s12192-014-0503-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Revised: 02/03/2014] [Accepted: 02/04/2014] [Indexed: 11/27/2022] Open
Abstract
The shell colour of many pulmonate land snail species is highly diverse. Besides a genetic basis, environmentally triggered epigenetic mechanisms including stress proteins as evolutionary capacitors are thought to influence such phenotypic diversity. In this study, we investigated the relationship of stress protein (Hsp70) levels with temperature stress tolerance, population structure and phenotypic diversity within and among different populations of a xerophilic Mediterranean snail species (Xeropicta derbentina). Hsp70 levels varied considerably among populations, and were significantly associated with shell colour diversity: individuals in populations exhibiting low diversity expressed higher Hsp70 levels both constitutively and under heat stress than those of phenotypically diverse populations. In contrast, population structure (cytochrome c oxidase subunit I gene) did not correlate with phenotypic diversity. However, genetic parameters (both within and among population differences) were able to explain variation in Hsp70 induction at elevated but non-pathologic temperatures. Our observation that (1) population structure had a high explanatory potential for Hsp70 induction and that (2) Hsp70 levels, in turn, correlated with phenotypic diversity while (3) population structure and phenotypic diversity failed to correlate provides empirical evidence for Hsp70 to act as a mediator between genotypic variation and phenotype and thus for chaperone-driven evolutionary capacitance in natural populations.
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Affiliation(s)
- Maddalena A. Di Lellis
- />Animal Physiological Ecology, Institute of Evolution and Ecology, Tübingen University, Konrad-Adenauer-Str. 20, D-72072 Tübingen, Germany
| | - Sergej Sereda
- />Department of Animal Ecology & Systematics, Justus Liebig University Giessen, Heinrich-Buff-Ring 26-32 IFZ, D-35392 Giessen, Germany
| | - Anna Geißler
- />Animal Physiological Ecology, Institute of Evolution and Ecology, Tübingen University, Konrad-Adenauer-Str. 20, D-72072 Tübingen, Germany
| | - Adrien Picot
- />Laboratory of Ecotoxicology (LEMA), EA 3222 PRES Normandie, Le Havre University, 25 Rue Philippe Lebon, F-76058 Le Havre Cedex, France
| | - Petra Arnold
- />Animal Physiological Ecology, Institute of Evolution and Ecology, Tübingen University, Konrad-Adenauer-Str. 20, D-72072 Tübingen, Germany
| | - Stefanie Lang
- />Animal Physiological Ecology, Institute of Evolution and Ecology, Tübingen University, Konrad-Adenauer-Str. 20, D-72072 Tübingen, Germany
| | - Sandra Troschinski
- />Animal Physiological Ecology, Institute of Evolution and Ecology, Tübingen University, Konrad-Adenauer-Str. 20, D-72072 Tübingen, Germany
| | - Andreas Dieterich
- />Animal Physiological Ecology, Institute of Evolution and Ecology, Tübingen University, Konrad-Adenauer-Str. 20, D-72072 Tübingen, Germany
| | - Torsten Hauffe
- />Department of Animal Ecology & Systematics, Justus Liebig University Giessen, Heinrich-Buff-Ring 26-32 IFZ, D-35392 Giessen, Germany
| | - Yvan Capowiez
- />Université d’Avignon et des Pays de Vaucluse, Laboratoire de Toxicologie Environnementale, UMR 406 UAPV/INRA, Domaine St Paul, Site Agroparc, F-84914 Avignon Cedex 9, France
| | - Christophe Mazzia
- />IMBE UMR 7263, Institut Mediterranéen de Biodiversité et d’Ecologie marine et continentale, Université d’Avignon et des Pays de Vaucluse, Pole Agrosciences, 301 rue Baruch de Spinoza, BP 21239, F-84916 Avignon cedex 9, France
| | - Thomas Knigge
- />Laboratory of Ecotoxicology (LEMA), EA 3222 PRES Normandie, Le Havre University, 25 Rue Philippe Lebon, F-76058 Le Havre Cedex, France
| | - Tiphaine Monsinjon
- />Laboratory of Ecotoxicology (LEMA), EA 3222 PRES Normandie, Le Havre University, 25 Rue Philippe Lebon, F-76058 Le Havre Cedex, France
| | - Stefanie Krais
- />Animal Physiological Ecology, Institute of Evolution and Ecology, Tübingen University, Konrad-Adenauer-Str. 20, D-72072 Tübingen, Germany
| | - Thomas Wilke
- />Department of Animal Ecology & Systematics, Justus Liebig University Giessen, Heinrich-Buff-Ring 26-32 IFZ, D-35392 Giessen, Germany
| | - Rita Triebskorn
- />Animal Physiological Ecology, Institute of Evolution and Ecology, Tübingen University, Konrad-Adenauer-Str. 20, D-72072 Tübingen, Germany
- />Steinbeis-Transfer Center Ecotoxicology and Ecophysiology Rottenburg, Blumenstr. 13, D-72108 Rottenburg, Germany
| | - Heinz-R. Köhler
- />Animal Physiological Ecology, Institute of Evolution and Ecology, Tübingen University, Konrad-Adenauer-Str. 20, D-72072 Tübingen, Germany
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Soares Magalhães RJ, Salamat MS, Leonardo L, Gray DJ, Carabin H, Halton K, McManus DP, Williams GM, Rivera P, Saniel O, Hernandez L, Yakob L, McGarvey S, Clements A. Geographical distribution of human Schistosoma japonicum infection in The Philippines: tools to support disease control and further elimination. Int J Parasitol 2014; 44:977-84. [PMID: 25128879 DOI: 10.1016/j.ijpara.2014.06.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Revised: 06/10/2014] [Accepted: 06/11/2014] [Indexed: 12/15/2022]
Abstract
Schistosoma japonicum infection is believed to be endemic in 28 of the 80 provinces of The Philippines and the most recent data on schistosomiasis prevalence have shown considerable variability between provinces. In order to increase the efficient allocation of parasitic disease control resources in the country, we aimed to describe the small-scale spatial variation in S. japonicum prevalence across The Philippines, quantify the role of the physical environment in driving the spatial variation of S. japonicum, and develop a predictive risk map of S. japonicum infection. Data on S. japonicum infection from 35,754 individuals across the country were geo-located at the barangay level and included in the analysis. The analysis was then stratified geographically for the regions of Luzon, the Visayas and Mindanao. Zero-inflated binomial Bayesian geostatistical models of S. japonicum prevalence were developed and diagnostic uncertainty was incorporated. Results of the analysis show that in the three regions, males and individuals aged ⩾20years had significantly higher prevalence of S. japonicum compared with females and children <5years. The role of the environmental variables differed between regions of The Philippines. Schistosoma japonicum infection was widespread in the Visayas whereas it was much more focal in Luzon and Mindanao. This analysis revealed significant spatial variation in the prevalence of S. japonicum infection in The Philippines. This suggests that a spatially targeted approach to schistosomiasis interventions, including mass drug administration, is warranted. When financially possible, additional schistosomiasis surveys should be prioritised for areas identified to be at high risk but which were under-represented in our dataset.
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Affiliation(s)
- Ricardo J Soares Magalhães
- University of Queensland, Infectious Disease Epidemiology Unit, School of Population Health, Public Health Building, Herston Road, 4006 Herston, Australia; University of Queensland, School of Veterinary Science, Gatton, 4343 Gatton, Australia.
| | - Maria Sonia Salamat
- University of The Philippines-Manila, College of Public Health, Department of Parasitology, Ermita, Manila, Philippines
| | - Lydia Leonardo
- University of The Philippines-Manila, College of Public Health, Department of Parasitology, Ermita, Manila, Philippines
| | - Darren J Gray
- University of Queensland, Infectious Disease Epidemiology Unit, School of Population Health, Public Health Building, Herston Road, 4006 Herston, Australia; Infectious Disease Division, Queensland Institute of Medical Research, Herston, Queensland, Australia; Research School of Population Health, The Australian National University, Canberra, Australia
| | - Hélène Carabin
- Department of Biostatistics and Epidemiology, College of Public Health, University of Oklahoma Health Sciences Center, OK, USA
| | - Kate Halton
- Institute for Health and Biomedical Innovation, Queensland University of Technology, Kelvin Grove, Queensland, Australia
| | - Donald P McManus
- Infectious Disease Division, Queensland Institute of Medical Research, Herston, Queensland, Australia
| | - Gail M Williams
- University of Queensland, Infectious Disease Epidemiology Unit, School of Population Health, Public Health Building, Herston Road, 4006 Herston, Australia
| | - Pilarita Rivera
- University of The Philippines-Manila, College of Public Health, Department of Parasitology, Ermita, Manila, Philippines
| | - Ofelia Saniel
- University of The Philippines-Manila, College of Public Health, Department of Parasitology, Ermita, Manila, Philippines
| | - Leda Hernandez
- Philippine Department of Health National Center for Disease Prevention and Control, Manila, Philippines
| | - Laith Yakob
- University of Queensland, Infectious Disease Epidemiology Unit, School of Population Health, Public Health Building, Herston Road, 4006 Herston, Australia
| | - Stephen McGarvey
- International Health Institute, Brown University, Providence, RI, USA
| | - Archie Clements
- University of Queensland, Infectious Disease Epidemiology Unit, School of Population Health, Public Health Building, Herston Road, 4006 Herston, Australia; Research School of Population Health, The Australian National University, Canberra, Australia
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Pandey PK, Kass PH, Soupir ML, Biswas S, Singh VP. Contamination of water resources by pathogenic bacteria. AMB Express 2014; 4:51. [PMID: 25006540 PMCID: PMC4077002 DOI: 10.1186/s13568-014-0051-x] [Citation(s) in RCA: 237] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2014] [Accepted: 05/27/2014] [Indexed: 01/22/2023] Open
Abstract
Water-borne pathogen contamination in water resources and related diseases are a major water quality concern throughout the world. Increasing interest in controlling water-borne pathogens in water resources evidenced by a large number of recent publications clearly attests to the need for studies that synthesize knowledge from multiple fields covering comparative aspects of pathogen contamination, and unify them in a single place in order to present and address the problem as a whole. Providing a broader perceptive of pathogen contamination in freshwater (rivers, lakes, reservoirs, groundwater) and saline water (estuaries and coastal waters) resources, this review paper attempts to develop the first comprehensive single source of existing information on pathogen contamination in multiple types of water resources. In addition, a comprehensive discussion describes the challenges associated with using indicator organisms. Potential impacts of water resources development on pathogen contamination as well as challenges that lie ahead for addressing pathogen contamination are also discussed.
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Troschinski S, Di Lellis MA, Sereda S, Hauffe T, Wilke T, Triebskorn R, Köhler HR. Intraspecific variation in cellular and biochemical heat response strategies of Mediterranean Xeropicta derbentina [Pulmonata, Hygromiidae]. PLoS One 2014; 9:e86613. [PMID: 24475158 PMCID: PMC3903566 DOI: 10.1371/journal.pone.0086613] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Accepted: 12/11/2013] [Indexed: 12/04/2022] Open
Abstract
Dry and hot environments challenge the survival of terrestrial snails. To minimize overheating and desiccation, physiological and biochemical adaptations are of high importance for these animals. In the present study, seven populations of the Mediterranean land snail species Xeropicta derbentina were sampled from their natural habitat in order to investigate the intraspecific variation of cellular and biochemical mechanisms, which are assigned to contribute to heat resistance. Furthermore, we tested whether genetic parameters are correlated with these physiological heat stress response patterns. Specimens of each population were individually exposed to elevated temperatures (25 to 52°C) for 8 h in the laboratory. After exposure, the health condition of the snails' hepatopancreas was examined by means of qualitative description and semi-quantitative assessment of histopathological effects. In addition, the heat-shock protein 70 level (Hsp70) was determined. Generally, calcium cells of the hepatopancreas were more heat resistant than digestive cells - this phenomenon was associated with elevated Hsp70 levels at 40°C.We observed considerable variation in the snails' heat response strategy: Individuals from three populations invested much energy in producing a highly elevated Hsp70 level, whereas three other populations invested energy in moderate stress protein levels - both strategies were in association with cellular functionality. Furthermore, one population kept cellular condition stable despite a low Hsp70 level until 40°C exposure, whereas prominent cellular reactions were observed above this thermal limit. Genetic diversity (mitochondrial cytochrome c oxidase subunit I gene) within populations was low. Nevertheless, when using genetic indices as explanatory variables in a multivariate regression tree (MRT) analysis, population structure explained mean differences in cellular and biochemical heat stress responses, especially in the group exposed to 40°C. Our study showed that, even in similar habitats within a close range, populations of the same species use different stress response strategies that all rendered survival possible.
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Affiliation(s)
- Sandra Troschinski
- Animal Physiological Ecology, Institute of Evolution and Ecology, Tübingen University, Tübingen, Germany
| | - Maddalena A. Di Lellis
- Animal Physiological Ecology, Institute of Evolution and Ecology, Tübingen University, Tübingen, Germany
| | - Sergej Sereda
- Department of Animal Ecology & Systematics, Justus Liebig University Giessen, Giessen, Germany
| | - Torsten Hauffe
- Department of Animal Ecology & Systematics, Justus Liebig University Giessen, Giessen, Germany
| | - Thomas Wilke
- Department of Animal Ecology & Systematics, Justus Liebig University Giessen, Giessen, Germany
| | - Rita Triebskorn
- Animal Physiological Ecology, Institute of Evolution and Ecology, Tübingen University, Tübingen, Germany
| | - Heinz-R. Köhler
- Animal Physiological Ecology, Institute of Evolution and Ecology, Tübingen University, Tübingen, Germany
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