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Miller JD, Staddon C, Salzberg A, Lucks JB, Bruine de Bruin W, Young SL. Self-reported anticipated harm from drinking water across 141 countries. Nat Commun 2024; 15:7320. [PMID: 39183250 PMCID: PMC11345419 DOI: 10.1038/s41467-024-51528-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Accepted: 08/08/2024] [Indexed: 08/27/2024] Open
Abstract
Perceptions of drinking water safety shape numerous health-related behaviors and attitudes, including water use and valuation, but they are not typically measured. We therefore characterize self-reported anticipated harm from drinking water in 141 countries using nationally representative survey data from the World Risk Poll (n = 148,585 individuals) and identify national- and individual-level predictors. We find that more than half (52.3%) of adults across sampled countries anticipate serious harm from drinking water in the next two years. The prevalence of self-reported anticipated harm is higher among women (relative to men), urban (relative to rural) residents, individuals with self-reported financial difficulties (relative to those getting by on their present income), and individuals with more years of education. In a country-level multivariable model, the percentage of the population reporting recent harm from drinking water, percentage of deaths attributable to unsafe water, and perceptions of public-sector corruption are associated with the prevalence of self-reported anticipated harm. Consideration of users' perspectives, particularly with respect to trust in the safety and governance of water services, is critical for promoting effective water resource management and ensuring the use, safety, and sustainability of water services.
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Affiliation(s)
- Joshua D Miller
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Chad Staddon
- School for Architecture and Environment, University of the West of England, Bristol, UK
| | - Aaron Salzberg
- Department of Environmental Science and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Julius B Lucks
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL, USA
- Center for Synthetic Biology, Northwestern University, Evanston, IL, USA
- Center for Water Research, Northwestern University, Evanston, IL, USA
| | - Wändi Bruine de Bruin
- Sol Price School of Public Policy and Dornsife Department of Psychology, University of Southern California, Los Angeles, CA, USA
| | - Sera L Young
- Center for Synthetic Biology, Northwestern University, Evanston, IL, USA.
- Center for Water Research, Northwestern University, Evanston, IL, USA.
- Department of Anthropology & Institute for Policy Research, Northwestern University, Evanston, IL, USA.
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2
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Greenwood EE, Lauber T, van den Hoogen J, Donmez A, Bain RES, Johnston R, Crowther TW, Julian TR. Mapping safe drinking water use in low- and middle-income countries. Science 2024; 385:784-790. [PMID: 39146419 DOI: 10.1126/science.adh9578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 06/26/2024] [Indexed: 08/17/2024]
Abstract
Safe drinking water access is a human right, but data on safely managed drinking water services (SMDWS) is lacking for more than half of the global population. We estimate SMDWS use in 135 low- and middle-income countries (LMICs) at subnational levels with a geospatial modeling approach, combining existing household survey data with available global geospatial datasets. We estimate that only one in three people used SMDWS in LMICs in 2020 and identified fecal contamination as the primary limiting factor affecting almost half of the population of LMICs. Our results are relevant for raising awareness about the challenges and limitations of current global monitoring approaches and demonstrating how globally available geospatial data can be leveraged to fill data gaps and identify priority areas in LMICs.
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Affiliation(s)
- Esther E Greenwood
- Department of Environmental Systems Science, ETH Zurich, Swiss Federal Institute of Technology, Zurich, Switzerland
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland
| | - Thomas Lauber
- Department of Environmental Systems Science, ETH Zurich, Swiss Federal Institute of Technology, Zurich, Switzerland
| | - Johan van den Hoogen
- Department of Environmental Systems Science, ETH Zurich, Swiss Federal Institute of Technology, Zurich, Switzerland
| | - Ayca Donmez
- Division of Data, Analytics, Planning and Monitoring, United Nations Children's Fund, New York, NY, USA
| | - Robert E S Bain
- Division of Data, Analytics, Planning and Monitoring, United Nations Children's Fund, New York, NY, USA
- Regional Office for the Middle East and North Africa, United Nations Children's Fund, Amman, Jordan
| | - Richard Johnston
- Department of Environment, Climate Change and Health, World Health Organization, Geneva, Switzerland
| | - Thomas W Crowther
- Department of Environmental Systems Science, ETH Zurich, Swiss Federal Institute of Technology, Zurich, Switzerland
| | - Timothy R Julian
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland
- Swiss Tropical and Public Health Institute, Allschwill, Switzerland
- University of Basel, Basel, Switzerland
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3
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Cao S, Wan Q, Cao R, Wang J, Huang T, Wen G. Solar/ClO 2 system inactivates fungal spores in drinking water: Synergy, efficiency and mechanisms. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 948:174886. [PMID: 39032749 DOI: 10.1016/j.scitotenv.2024.174886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2024] [Revised: 06/24/2024] [Accepted: 07/17/2024] [Indexed: 07/23/2024]
Abstract
The risk of fungal pollution in drinking water has been paid attention. Solar/chlorine dioxide (ClO2) combined system is an environment-friendly, economical and efficient disinfection method, especially for countries and regions that are economically backward and still exposed to unsafe drinking water. In this paper, the kinetics, influencing factors, mechanism and regrowth potential of inactivated Aspergillus niger (A. niger) spores by solar/ClO2 were reported for the first time. The inactivation curve can be divided into three stages: instant inactivation within 1-2 min, slow linear inactivation and finally a tail. The synergistic factors produced by solar/ClO2 in terms of log reduction and maximum inactivation rate were 1.194 and 1.112, respectively. The inhibitory effect on the regrowth of A. niger spores inactivated by solar/ClO2 was also stronger than that by ClO2 alone. Strongly oxidizing reactive species produced by solar/ClO2 accelerated the accumulation of endogenic reactive oxygen species (ROS) caused by oxidation stress of A. niger spores, improving the inactivation ability of the system. The inactivation order of A. niger spores was: loss of culturability, accumulation of intracellular ROS, loss of membrane integrity, leakage of intracellular species and change of morphology. The inactivation performance of solar/ClO2 was better than solar/chlor(am)ine according to the comparison of inactivation efficiency and regrowth potential. Results also suggested that solar/ClO2 process was more suitable for the treatment of ground water sources.
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Affiliation(s)
- Shulei Cao
- Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an 710055, PR China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China
| | - Qiqi Wan
- Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an 710055, PR China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China
| | - Ruihua Cao
- Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an 710055, PR China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China
| | - Jingyi Wang
- Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an 710055, PR China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China
| | - Tinglin Huang
- Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an 710055, PR China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China; Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, PR China
| | - Gang Wen
- Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an 710055, PR China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China; Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, PR China.
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4
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Fejfar D, Tracy W, Kelly E, Moffa M, Bain R, Bartram J, Anderson D, Cronk R. Identifying predictors of E. coli in rural household water in sub-Saharan Africa using elimination regression. ENVIRONMENTAL SCIENCE : WATER RESEARCH & TECHNOLOGY 2024; 10:1147-1159. [PMID: 38798903 PMCID: PMC11115386 DOI: 10.1039/d3ew00915g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
Exposure to fecally contaminated drinking water contributes to the global disease burden, especially in sub-Saharan Africa (SSA). We used cross-sectional data and elimination regression analysis to examine factors influencing E. coli contamination in household drinking water samples from 4,499 rural households in nine countries in SSA (Malawi, Mozambique, and Zambia in Southern Africa; Ghana, Mali, and Niger in Western Africa; and Kenya, Rwanda, and Tanzania in Eastern Africa). The proportion of household water samples containing E. coli was 71%, ranging from 45% (Malawi) to 89% (Tanzania). Pooled and multi-country predictive logistic regression models showed that using an unimproved-type water source, the absence of a community water committee, and domestic animal ownership were significantly associated with household drinking water contamination. Household water treatment and storage practices, sanitation and hygiene practices, and payment for drinking water were not significantly associated with E. coli contamination in any model. The season was a significant predictor of E. coli in the pooled model; samples collected in the rainy season were 2.3 [2.0, 2.7] times as likely to be contaminated with E. coli. Practitioners and policymakers should prioritize implementing piped on-plot water services, establishing effective local water source management structures, and incorporating animal husbandry practices into water, sanitation, and hygiene interventions.
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Affiliation(s)
- Donald Fejfar
- The Water Institute, Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 135 Dauer Drive, CB #7431, Chapel Hill, North Carolina 27599, United States
- Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 3101 McGavran-Greenberg Hall, Chapel Hill, North Carolina 27599, United States
| | - Wren Tracy
- ICF, 2635 Meridian Pkwy Suite 200, Durham, North Carolina, 27713, United States
| | - Emma Kelly
- The Water Institute, Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 135 Dauer Drive, CB #7431, Chapel Hill, North Carolina 27599, United States
- The Water Project, PO Box 3353, Concord, New Hampshire, 03302, USA
| | - Michelle Moffa
- The Water Institute, Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 135 Dauer Drive, CB #7431, Chapel Hill, North Carolina 27599, United States
| | - Robert Bain
- Regional Office for the Middle East and North Africa, UNICEF, Amman, Jordan
| | - Jamie Bartram
- The Water Institute, Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 135 Dauer Drive, CB #7431, Chapel Hill, North Carolina 27599, United States
- School of Civil Engineering, University of Leeds, Leeds, United Kingdom
| | - Darcy Anderson
- The Water Institute, Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 135 Dauer Drive, CB #7431, Chapel Hill, North Carolina 27599, United States
| | - Ryan Cronk
- The Water Institute, Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 135 Dauer Drive, CB #7431, Chapel Hill, North Carolina 27599, United States
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5
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Laauwen M, Nowicki S. Reinforcing Feedbacks for Sustainable Implementation of Rural Drinking-Water Treatment Technology. ACS ES&T WATER 2024; 4:1763-1774. [PMID: 38633363 PMCID: PMC11019543 DOI: 10.1021/acsestwater.3c00779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 02/09/2024] [Accepted: 03/06/2024] [Indexed: 04/19/2024]
Abstract
Progress toward universal access to safe drinking water depends on rural water service delivery models that incorporate water safety management. Water supplies of all types have high rates of fecal contamination unless water safety risks are actively managed through water source protection, treatment, distribution, and storage. Recognizing the role of treatment within this broader risk-based framework, this study focuses on the implementation of passive chlorination and ultraviolet (UV) disinfection technologies in rural settings. These technologies can reduce the health risk from microbiological contaminants in drinking water; however, technology-focused treatment interventions have had limited sustainability in rural settings. This study examines the requirements for sustainable implementation of rural water treatment through qualitative content analysis of 26 key informant interviews, representing passive chlorination and UV disinfection projects in rural areas in South America, Africa, and Asia. The analysis is aligned with the RE-AIM framework and delivers insight into 18 principal enablers and barriers to rural water treatment sustainability. Analysis of the interrelationships among these factors identifies leverage points and encourages fit-for-purpose intervention design reinforced by collaboration between facilitating actors through hybrid service delivery models. Further work should prioritize health impact evidence, water quality reporting guidance, and technological capabilities that optimize trade-offs in fit-for-purpose treatment design.
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Affiliation(s)
- Merel Laauwen
- School
of Geography and the Environment, University
of Oxford, South Parks Road, Oxford OX1 3QY, U.K.
| | - Saskia Nowicki
- School
of Geography and the Environment, University
of Oxford, South Parks Road, Oxford OX1 3QY, U.K.
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6
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Santos TM, Wendt A, Coll CVN, Bohren MA, Barros AJD. E. coli contamination of drinking water sources in rural and urban settings: an analysis of 38 nationally representative household surveys (2014-2021). JOURNAL OF WATER AND HEALTH 2023; 21:1834-1846. [PMID: 38153715 PMCID: wh_2023_174 DOI: 10.2166/wh.2023.174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2023]
Abstract
The world is not on track to achieve universal access to safely managed water by 2030, and access is substantially lower in rural areas. This Sustainable Development Goal target and many other global indicators rely on the classification of improved water sources for monitoring access. We aimed to investigate contamination in drinking water sources, comparing improved and unimproved sources in urban and rural settings. We used data from Multiple Indicator Cluster Surveys, which tested samples from the household water source and a glass of water for Escherichia coli contamination across 38 countries. Contamination was widespread and alarmingly high in almost all countries, settings, and water sources, with substantial inequalities between and within countries. Water contamination was found in 51.7% of households at the source and 70.8% in the glass of water. Some improved sources (e.g., protected wells and rainwater) were as likely to be contaminated as unimproved sources. Some sources, like piped water, were considerably more likely to be contaminated in rural than urban areas, while no difference was observed for others. Monitoring water contamination along with further investigation in water collection, storage, and source classification is essential and must be expanded to achieve universal access to safely managed water.
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Affiliation(s)
- Thiago M Santos
- International Center for Equity in Health, Federal University of Pelotas, Rua Deodoro 1160, Pelotas, RS 96020-220, Brazil; Gender and Women's Health Unit, Nossal Institute for Global Health, School of Population and Global Health, University of Melbourne, 207 Bouverie St, Carlton, VIC 3053, Australia E-mail:
| | - Andrea Wendt
- International Center for Equity in Health, Federal University of Pelotas, Rua Deodoro 1160, Pelotas, RS 96020-220, Brazil; Programa de Pós-Graduação em Tecnologia em Saúde, Pontifícia Universidade Católica do Paraná, Rua Imaculada Conceição 1155, Curitiba, PR 80215-901, Brazil
| | - Carolina V N Coll
- International Center for Equity in Health, Federal University of Pelotas, Rua Deodoro 1160, Pelotas, RS 96020-220, Brazil
| | - Meghan A Bohren
- Gender and Women's Health Unit, Nossal Institute for Global Health, School of Population and Global Health, University of Melbourne, 207 Bouverie St, Carlton, VIC 3053, Australia
| | - Aluisio J D Barros
- International Center for Equity in Health, Federal University of Pelotas, Rua Deodoro 1160, Pelotas, RS 96020-220, Brazil
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7
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Chaúque BJM, Corção G, Benetti AD, Rott MB. A challenge in washing water with the sun: 24h of SODIS fails to inactivate Acanthamoeba castellanii cysts and internalized Pseudomonas aeruginosa under strong real sun conditions. Photochem Photobiol Sci 2023; 22:2179-2188. [PMID: 37296325 DOI: 10.1007/s43630-023-00440-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Accepted: 05/19/2023] [Indexed: 06/12/2023]
Abstract
Despite access to drinking water being a basic human right, the availability of safe drinking water remains a privilege that many do not have and as a result, many lives are lost each year due to waterborne diseases associated with the consumption of biologically unsafe water. To face this situation, different low-cost household drinking water treatment technologies (HDWT) have been developed, and among them is solar disinfection (SODIS). Despite the effectiveness of SODIS and the epidemiological gains being consistently documented in the literature, there is a lack of evidence of the effectiveness of the batch-SODIS process against protozoan cysts as well as their internalized bacteria under real sun conditions. This work evaluated the effectiveness of the batch-SODIS process on the viability of Acanthamoeba castellanii cysts, and internalized Pseudomonas aeruginosa. Dechlorinated tap water contaminated with 5.6 × 103 cysts/L, contained in PET (polyethylene terephthalate) bottles, was exposed for 8 h a day to strong sunlight (531-1083 W/m2 of maximum insolation) for 3 consecutive days. The maximum water temperature inside the reactors ranged from 37 to 50 °C. Cyst viability was assessed by inducing excystment on non-nutrient agar, or in water with heat-inactivated Escherichia coli. After sun exposure for 0, 8, 16 and 24 h, the cysts remained viable and without any perceptible impairment in their ability to excyst. 3 and 5.5 log CFU/mL of P. aeruginosa were detected in water containing untreated and treated cysts, respectively, after 3 days of incubation at 30 °C. The batch-SODIS process is unable to inactivate A. castellanii cysts as well as its internalized bacteria. Although the use of batch SODIS by communities should continue to be encouraged, SODIS-disinfected water should be consumed within 3 days.
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Affiliation(s)
- Beni Jequicene Mussengue Chaúque
- Laboratory of Protozoology and Microbiological Analyses, Department of Microbiology, Immunology and Parasitology, Institute of Basic Health Sciences, Universidade Federal do Rio Grande do Sul, Ramiro Barcelos Street, 2600, Porto Alegre/RS, Brazil
- Center of Studies in Science and Technology (NECET), Biology Course, Universidade Rovuma, Niassa Branch, Lichinga, Mozambique
| | - Gertrudes Corção
- Laboratory of Protozoology and Microbiological Analyses, Department of Microbiology, Immunology and Parasitology, Institute of Basic Health Sciences, Universidade Federal do Rio Grande do Sul, Ramiro Barcelos Street, 2600, Porto Alegre/RS, Brazil
| | | | - Marilise Brittes Rott
- Laboratory of Protozoology and Microbiological Analyses, Department of Microbiology, Immunology and Parasitology, Institute of Basic Health Sciences, Universidade Federal do Rio Grande do Sul, Ramiro Barcelos Street, 2600, Porto Alegre/RS, Brazil.
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8
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Wolf J, Johnston RB, Ambelu A, Arnold BF, Bain R, Brauer M, Brown J, Caruso BA, Clasen T, Colford JM, Mills JE, Evans B, Freeman MC, Gordon B, Kang G, Lanata CF, Medlicott KO, Prüss-Ustün A, Troeger C, Boisson S, Cumming O. Burden of disease attributable to unsafe drinking water, sanitation, and hygiene in domestic settings: a global analysis for selected adverse health outcomes. Lancet 2023; 401:2060-2071. [PMID: 37290458 PMCID: PMC10290941 DOI: 10.1016/s0140-6736(23)00458-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 01/25/2023] [Accepted: 02/28/2023] [Indexed: 06/10/2023]
Abstract
BACKGROUND Assessments of disease burden are important to inform national, regional, and global strategies and to guide investment. We aimed to estimate the drinking water, sanitation, and hygiene (WASH)-attributable burden of disease for diarrhoea, acute respiratory infections, undernutrition, and soil-transmitted helminthiasis, using the WASH service levels used to monitor the UN Sustainable Development Goals (SDGs) as counterfactual minimum risk-exposure levels. METHODS We assessed the WASH-attributable disease burden of the four health outcomes overall and disaggregated by region, age, and sex for the year 2019. We calculated WASH-attributable fractions of diarrhoea and acute respiratory infections by country using modelled WASH exposures and exposure-response relationships from two updated meta-analyses. We used the WHO and UNICEF Joint Monitoring Programme for Water Supply, Sanitation and Hygiene public database to estimate population exposure to different WASH service levels. WASH-attributable undernutrition was estimated by combining the population attributable fractions (PAF) of diarrhoea caused by unsafe WASH and the PAF of undernutrition caused by diarrhoea. Soil-transmitted helminthiasis was fully attributed to unsafe WASH. FINDINGS We estimate that 1·4 (95% CI 1·3-1·5) million deaths and 74 (68-80) million disability-adjusted life-years (DALYs) could have been prevented by safe WASH in 2019 across the four designated outcomes, representing 2·5% of global deaths and 2·9% of global DALYs from all causes. The proportion of diarrhoea that is attributable to unsafe WASH is 0·69 (0·65-0·72), 0·14 (0·13-0·17) for acute respiratory infections, and 0·10 (0·09-0·10) for undernutrition, and we assume that the entire disease burden from soil-transmitted helminthiasis was attributable to unsafe WASH. INTERPRETATION WASH-attributable burden of disease estimates based on the levels of service established under the SDG framework show that progress towards the internationally agreed goal of safely managed WASH services for all would yield major public-health returns. FUNDING WHO and Foreign, Commonwealth & Development Office.
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Affiliation(s)
- Jennyfer Wolf
- Department of Environment, Climate Change and Health, World Health Organization, Geneva, Switzerland.
| | - Richard B Johnston
- Department of Environment, Climate Change and Health, World Health Organization, Geneva, Switzerland
| | - Argaw Ambelu
- Division of Water and Health, Ethiopian Institution of Water Resources, Addis Ababa University, Addis Ababa, Ethiopia
| | - Benjamin F Arnold
- FI Proctor Foundation, University of California, San Francisco, CA, USA
| | - Robert Bain
- UNICEF Middle East and North Africa, Amman, Jordan
| | - Michael Brauer
- Institute for Health Metrics and Evaluation, University of Washington, Seattle, WA, USA; School of Population and Public Health, University of British Columbia, Vancouver, BC, Canada
| | - Joe Brown
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Bethany A Caruso
- The Hubert Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - Thomas Clasen
- Gangarose Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - John M Colford
- Division of Epidemiology and Biostatistics, School of Public Health, University of California, Berkeley, CA, USA
| | - Joanna Esteves Mills
- Department of Environment, Climate Change and Health, World Health Organization, Geneva, Switzerland
| | - Barbara Evans
- School of Civil Engineering, University of Leeds, Leeds, UK
| | - Matthew C Freeman
- Gangarose Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - Bruce Gordon
- Department of Environment, Climate Change and Health, World Health Organization, Geneva, Switzerland
| | - Gagandeep Kang
- Wellcome Trust Research Laboratory, Division of Gastrointestinal Sciences, Christian Medical College, Vellore, Tami Nadu, India
| | - Claudio F Lanata
- Instituto de Investigación Nutricional, Lima, Peru; School of Medicine, Vanderbilt University, Nashville, TN, USA; Department of Epidemiology, London School of Hygiene & Tropical Medicine, London, UK
| | - Kate O Medlicott
- Department of Environment, Climate Change and Health, World Health Organization, Geneva, Switzerland
| | - Annette Prüss-Ustün
- Department of Environment, Climate Change and Health, World Health Organization, Geneva, Switzerland
| | - Christopher Troeger
- Department of Health Metrics Sciences, University of Washington, Seattle, WA, USA
| | - Sophie Boisson
- Department of Environment, Climate Change and Health, World Health Organization, Geneva, Switzerland
| | - Oliver Cumming
- Department of Disease Control, Faculty of Infectious Tropical Disease, London School of Hygiene & Tropical Medicine, London, UK
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9
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Liu R, Zhou Y, Liu Y, Guo R, Gao L. Association between living environmental quality and risk of arthritis in middle-aged and older adults: a national study in China. Front Public Health 2023; 11:1181625. [PMID: 37397775 PMCID: PMC10313337 DOI: 10.3389/fpubh.2023.1181625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 05/26/2023] [Indexed: 07/04/2023] Open
Abstract
Background The association between combined environmental factors and the risk of arthritis is still scarcely studied. The present study performed cross-sectional and cohort studies to explore the association between risk score of living environment quality and the risk of arthritis in middle-aged and older adults in China. Methods The study was based on China Health and Retirement Longitudinal Study (CHARLS), and it recruited 17,218 participants in the cross-sectional study and 11,242 participants in the seven-year follow-up study. The living environment quality was measured by household fuel types, household water sources, room temperature, residence types, and ambient concentration of PM2.5. Logistic regression and Cox proportional hazard regression models were utilized to examine the association between the living environment quality and the risk of arthritis. Competing risk models and stratified analyses were applied to further verify our results. Results Compared with individuals in the suitable environment group, people who lived in moderate (OR:1.28, 95%CI: 1.14-1.43) and unfavorable environments (OR:1.49, 95%CI:1.31-1.70) showed higher risks of arthritis when considering the multiple living environmental factors (P for trend <0.001) in the cross-sectional analysis. In the follow-up study, similar results (P for trend = 0.021), moderate environment group (HR:1.26, 95%CI:1.01-1.56) and unfavorable environment group (HR: 1.36, 95%CI: 1.07-1.74), were founded. Conclusion Inferior living environment might promote the development of arthritis. It is necessary for the public, especially old people, to improve the living environment, which may be the key to the primary prevention of arthritis.
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Affiliation(s)
- Ri Liu
- Department of Orthopedics, The Second Hospital of Tangshan, Tangshan, Hebei, China
| | - Yuefei Zhou
- Department of Orthopedics, The First Hospital of China Medical University, Shenyang, China
| | - Yang Liu
- Department of Biostatistics and Epidemiology, School of Public Health, China Medical University, Shenyang, China
| | - Run Guo
- Department of General Practice, Beijing Friendship Hospital of Capital Medical University, Beijing, China
| | - Lishu Gao
- Department of Endocrinology, Tangshan People’s Hospital, Tangshan, Hebei, China
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10
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Hidayangsih PS, Tjandrarini DH, Sukoco NEW, Sitorus N, Dharmayanti I, Ahmadi F. Chronic kidney disease in Indonesia: evidence from a national health survey. Osong Public Health Res Perspect 2023; 14:23-30. [PMID: 36944342 DOI: 10.24171/j.phrp.2022.0290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 01/19/2023] [Indexed: 02/15/2023] Open
Abstract
OBJECTIVES Several previous studies have stated that consuming certain foods and beverages might increase the risk of chronic kidney disease (CKD). This study aimed to examine the relationships of food and beverage consumption with other risk factors for CKD. METHODS Data sources included the 2018 Basic Health Research (Riskesdas) and the National Socio-Economic Survey (Susenas), which were analyzed using a cross-sectional design. The study samples were households from 34 provinces in Indonesia, and the analysis was performed with provincial aggregates. Data were analyzed using risk factor analysis followed by linear regression to identify relationships with CKD. RESULTS The prevalence of CKD in Indonesia was 0.38%. The province with the highest prevalence was North Kalimantan (0.64%), while the lowest was found in West Sulawesi (0.18%). Five major groups were formed from 15 identified risk factors using factor analysis. A linear regression model presented 1 significant selected factor (p=0.006, R2 =31%). The final model of risk factors included water quality, consumption of fatty foods, and a history of diabetes. CONCLUSIONS Drinking water quality, fatty food consumption, and diabetes are associated with CKD. There is a need to monitor drinking water, as well as to promote health education and provide comprehensive services for people with diabetes, to prevent CKD.
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Affiliation(s)
- Puti Sari Hidayangsih
- Research Center for Public Health and Nutrition, National Research and Innovation Agency, Jakarta, Indonesia
| | - Dwi Hapsari Tjandrarini
- Research Center for Public Health and Nutrition, National Research and Innovation Agency, Jakarta, Indonesia
| | - Noor Edi Widya Sukoco
- Research Center for Public Health and Nutrition, National Research and Innovation Agency, Jakarta, Indonesia
| | - Nikson Sitorus
- Research Center for Public Health and Nutrition, National Research and Innovation Agency, Jakarta, Indonesia
| | - Ika Dharmayanti
- Research Center for Public Health and Nutrition, National Research and Innovation Agency, Jakarta, Indonesia
| | - Feri Ahmadi
- Research Center for Public Health and Nutrition, National Research and Innovation Agency, Jakarta, Indonesia
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11
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Hernández-Vásquez A, Visconti-Lopez FJ, Vargas-Fernández R. Escherichia coli Contamination of Water for Human Consumption and Its Associated Factors in Peru: A Cross-Sectional Study. Am J Trop Med Hyg 2023; 108:187-194. [PMID: 36509044 PMCID: PMC9833058 DOI: 10.4269/ajtmh.22-0240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Accepted: 09/13/2022] [Indexed: 12/15/2022] Open
Abstract
The objective of the study was to determine the factors associated with the presence of Escherichia coli contamination in water supplies for human consumption in Peru. A secondary analysis of the Food and Nutrition Surveillance by Life Stages survey (VIANEV) of 2017-2018 was performed. The presence of E. coli contamination in the water samples for human consumption of the households evaluated was defined as a dependent variable. A supply was considered contaminated when there was at least 1 colony-forming unit of E. coli in 100 mL of water for human consumption. Data from 886 participants were analyzed. It was found that 25.2% of household water supply sources for human consumption had E. coli at the time of sampling. Water reservoirs such as buckets or other containers (adjusted prevalence ratio [aPR]: 1.15; 95% confidence interval [CI]: 1.18-1.93), households belonging to a poor wealth quintile (aPR: 1.82; 95% CI: 1.01-3.25), residing in a rural area (aPR: 1.36; 95% CI: 1.01-1.83), and having a low human development index (aPR: 2.12; 95% CI: 1.15-3.91) were more likely to contain E. coli in water supplies for human consumption. However, households with chlorine concentrations of 0.5 mg/L or more in water (aPR: 0.20; 95% CI: 0.11-0.33) and with household members with a higher education (aPR: 0.67; 95% CI: 0.45-0.99) were less likely to contain E. coli in drinking-water supplies. From 2017 to 2018, one in four Peruvians had contamination by E. coli in the water supply to their homes, which was associated with sociodemographic factors, management, and water treatment.
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Affiliation(s)
- Akram Hernández-Vásquez
- Centro de Excelencia en Investigaciones Económicas y Sociales en Salud, Vicerrectorado de Investigación, Universidad San Ignacio de Loyola, Lima, Peru
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12
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Levy K. Invited Perspective: Environmental Health Interventions Are Only as Good as Their Adoption. ENVIRONMENTAL HEALTH PERSPECTIVES 2023; 131:11303. [PMID: 36715545 PMCID: PMC9885850 DOI: 10.1289/ehp11906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Revised: 09/14/2022] [Accepted: 12/23/2022] [Indexed: 06/18/2023]
Affiliation(s)
- Karen Levy
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
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13
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Lopes RH, Silva CRDV, Silva ÍDS, Salvador PTCDO, Heller L, Uchôa SADC. Worldwide Surveillance Actions and Initiatives of Drinking Water Quality: A Scoping Review. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 20:559. [PMID: 36612879 PMCID: PMC9819457 DOI: 10.3390/ijerph20010559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Accepted: 12/25/2022] [Indexed: 06/17/2023]
Abstract
This study identified and mapped worldwide surveillance actions and initiatives of drinking water quality implemented by government agencies and public health services. The scoping review was conducted between July 2021 and August 2022 based on the Joanna Briggs Institute method. The search was performed in relevant databases and gray literature; 49 studies were retrieved. Quantitative variables were presented as absolute and relative frequencies, while qualitative variables were analyzed using the IRaMuTeQ software. The actions developed worldwide and their impacts and results generated four thematic classes: (1) assessment of coverage, accessibility, quantity, and drinking water quality in routine and emergency situations; (2) analysis of physical-chemical and microbiological parameters in public supply networks or alternative water supply solutions; (3) identification of household water contamination, communication, and education with the community; (4) and investigation of water-borne disease outbreaks. Preliminary results were shared with stakeholders to favor knowledge dissemination.
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Affiliation(s)
- Rayssa Horacio Lopes
- Graduation Program in Collective Health, Federal University of Rio Grande do Norte, Natal 59064-630, Brazil
| | | | - Ísis de Siqueira Silva
- Graduation Program in Collective Health, Federal University of Rio Grande do Norte, Natal 59064-630, Brazil
| | | | - Léo Heller
- René Rachou Institute, Oswaldo Cruz Foundation, Belo Horizonte 30190-009, Brazil
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14
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Haque S, Kirby MA, Iyakaremye L, Gebremariam A, Tessema G, Thomas E, Chang HH, Clasen T. Effects of adding household water filters to Rwanda's Community-Based Environmental Health Promotion Programme: a cluster-randomized controlled trial in Rwamagana district. NPJ CLEAN WATER 2022; 5:42. [PMID: 36118619 PMCID: PMC9464616 DOI: 10.1038/s41545-022-00185-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 08/19/2022] [Indexed: 06/15/2023]
Abstract
Unsafe drinking water remains a major cause of mortality and morbidity. While Rwanda's Community-Based Environmental Health Promotion Programme (CBEHPP) promotes boiling and safe storage, previous research found these efforts to be ineffective in reducing fecal contamination of drinking water. We conducted a cluster randomized control led trial to determine if adding a household water filter with safe storage to the CBEHPP would improve drinking water quality and reduce child diarrhea. We enrolled 1,199 households with a pregnant person or child under 5 across 60 randomly selected villages in Rwamagana district. CBEHPP implementers distributed and promoted water purifiers to a random half of villages. We conducted two unannounced follow-up visits over 13-16 months after the intervention delivery. The intervention reduced the proportions of households with detectable E. coli in drinking water samples (primary outcome) by 20% (PR 0.80, 95% CI 0.74-0.87, p < 0.001) and with moderate and higher fecal contamination (≥10 CFU/100 mL) by 35% (PR 0.65, 95% CI 0.57-0.74, p < 0.001). The proportion of children under 5 experiencing diarrhea in the last week was reduced by 49% (aPR 0.51, 95%CI 0.35-0.73, p < 0.001). Our findings identify an effective intervention for improving water quality and child health that can be added to the CBEHPP.
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Affiliation(s)
- Sabrina Haque
- Gangarosa Department of Environmental Health, Emory University Rollins School of Public Health, Atlanta, GA USA
| | - Miles A. Kirby
- Gangarosa Department of Environmental Health, Emory University Rollins School of Public Health, Atlanta, GA USA
- Department of Global Health and Population, Harvard T.H. Chan School of Public Health, Boston, MA USA
| | | | | | | | - Evan Thomas
- Mortenson Center in Global Engineering, University of Colorado, Boulder, CO USA
| | - Howard H. Chang
- Gangarosa Department of Environmental Health, Emory University Rollins School of Public Health, Atlanta, GA USA
| | - Thomas Clasen
- Gangarosa Department of Environmental Health, Emory University Rollins School of Public Health, Atlanta, GA USA
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15
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Chaúque BJM, Benetti AD, Brittes Rott M. Epidemiological and Immunological Gains from Solar Water Disinfection (SODIS): Fact or Wishful Thinking? Trop Med Int Health 2022; 27:873-880. [PMID: 35922391 DOI: 10.1111/tmi.13807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Indexed: 11/29/2022]
Abstract
OBJECTIVE There is still no consensus on the impact of using solar disinfection (SODIS) to reduce the prevalence of waterborne gastrointestinal diseases. The reported reduction in diarrhea prevalence among SODIS users has been attributed to the consumption of water free of viable pathogens. However, it has also been suggested that ingestion of SODIS-inactivated pathogens may induce protective immunological changes that may also contribute to a reduction in the frequency of diarrhea. The present study aimed to critically review the epidemiological and immunological gains of using SODIS. METHODS We critically reviewed 22 articles published in English, selected from 2,118 records systematically retrieved from the databases. RESULTS All trials (except one) reported a significant reduction in diarrhea prevalence among children using SODIS, but some of the data from trials report contrary findings. All in vitro and in vivo assays indicate that SODIS-inactivated pathogenic bacteria have the potential to induce immunological alterations that may result in protective immunological effects. Studies with a low risk of bias are still awaited to confirm the ability of using SODIS to reduce the prevalence of diarrhea. CONCLUSION Reducing the prevalence of diarrhea depends on the success of SODIS delivery strategies in inducing behavioral changes in communities that result in the production of SODIS-compliant outcomes. The results of trials reporting a reduction in the prevalence of diarrhea due to the use of SODIS seem to support the hypothesis of the contribution of the protective immunological effect against diarrhea in SODIS users.
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Affiliation(s)
- Beni Jequicene Mussengue Chaúque
- Department of Microbiology, Immunology and Parasitology, Institute of Basic Health Sciences, Universidade Federal do Rio Grande do Sul, Brazil.,Department of Science, Technology, Engineering and Mathematics, Universidade Rovuma, Niassa Branch, Mozambique
| | | | - Marilise Brittes Rott
- Department of Microbiology, Immunology and Parasitology, Institute of Basic Health Sciences, Universidade Federal do Rio Grande do Sul, Brazil
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16
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Wolf J, Hubbard S, Brauer M, Ambelu A, Arnold BF, Bain R, Bauza V, Brown J, Caruso BA, Clasen T, Colford JM, Freeman MC, Gordon B, Johnston RB, Mertens A, Prüss-Ustün A, Ross I, Stanaway J, Zhao JT, Cumming O, Boisson S. Effectiveness of interventions to improve drinking water, sanitation, and handwashing with soap on risk of diarrhoeal disease in children in low-income and middle-income settings: a systematic review and meta-analysis. Lancet 2022; 400:48-59. [PMID: 35780792 PMCID: PMC9251635 DOI: 10.1016/s0140-6736(22)00937-0] [Citation(s) in RCA: 63] [Impact Index Per Article: 31.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 04/26/2022] [Accepted: 05/17/2022] [Indexed: 12/20/2022]
Abstract
BACKGROUND Estimates of the effectiveness of water, sanitation, and hygiene (WASH) interventions that provide high levels of service on childhood diarrhoea are scarce. We aimed to provide up-to-date estimates on the burden of disease attributable to WASH and on the effects of different types of WASH interventions on childhood diarrhoea in low-income and middle-income countries (LMICs). METHODS In this systematic review and meta-analysis, we updated previous reviews following their search strategy by searching MEDLINE, Embase, Scopus, Cochrane Library, and BIOSIS Citation Index for studies of basic WASH interventions and of WASH interventions providing a high level of service, published between Jan 1, 2016, and May 25, 2021. We included randomised and non-randomised controlled trials conducted at household or community level that matched exposure categories of the so-called service ladder approach of the Sustainable Development Goal (SDG) for WASH. Two reviewers independently extracted study-level data and assessed risk of bias using a modified Newcastle-Ottawa Scale and certainty of evidence using a modified Grading of Recommendations, Assessment, Development, and Evaluation approach. We analysed extracted relative risks (RRs) and 95% CIs using random-effects meta-analyses and meta-regression models. This study is registered with PROSPERO, CRD42016043164. FINDINGS 19 837 records were identified from the search, of which 124 studies were included, providing 83 water (62 616 children), 20 sanitation (40 799 children), and 41 hygiene (98 416 children) comparisons. Compared with untreated water from an unimproved source, risk of diarrhoea was reduced by up to 50% with water treated at point of use (POU): filtration (n=23 studies; RR 0·50 [95% CI 0·41-0·60]), solar treatment (n=13; 0·63 [0·50-0·80]), and chlorination (n=25; 0·66 [0·56-0·77]). Compared with an unimproved source, provision of an improved drinking water supply on premises with higher water quality reduced diarrhoea risk by 52% (n=2; 0·48 [0·26-0·87]). Overall, sanitation interventions reduced diarrhoea risk by 24% (0·76 [0·61-0·94]). Compared with unimproved sanitation, providing sewer connection reduced diarrhoea risk by 47% (n=5; 0·53 [0·30-0·93]). Promotion of handwashing with soap reduced diarrhoea risk by 30% (0·70 [0·64-0·76]). INTERPRETATION WASH interventions reduced risk of diarrhoea in children in LMICs. Interventions supplying either water filtered at POU, higher water quality from an improved source on premises, or basic sanitation services with sewer connection were associated with increased reductions. Our results support higher service levels called for under SDG 6. Notably, no studies evaluated interventions that delivered access to safely managed WASH services, the level of service to which universal coverage by 2030 is committed under the SDG. FUNDING WHO, Foreign, Commonwealth & Development Office, and National Institute of Environmental Health Sciences.
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Affiliation(s)
- Jennyfer Wolf
- Department of Environmental, Climate Change and Health, WHO, Geneva, Switzerland.
| | - Sydney Hubbard
- Gangarosa Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - Michael Brauer
- Institute for Health Metrics and Evaluation, University of Washington, Seattle, WA, USA; School of Population and Public Health, University of British Columbia, Vancouver, BC, Canada
| | - Argaw Ambelu
- Department of Environmental Health Sciences and Technology, Faculty of Public Health, Jimma University, Jimma, Ethiopia
| | - Benjamin F Arnold
- Division of Epidemiology and Biostatistics, School of Public Health, University of California, Berkeley, CA, USA
| | - Robert Bain
- UNICEF Middle East and North Africa, Amman, Jordan
| | - Valerie Bauza
- Gangarosa Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - Joe Brown
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, NC, USA
| | - Bethany A Caruso
- The Hubert Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - Thomas Clasen
- Gangarosa Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - John M Colford
- Division of Epidemiology and Biostatistics, School of Public Health, University of California, Berkeley, CA, USA
| | - Matthew C Freeman
- Gangarosa Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - Bruce Gordon
- Department of Environmental, Climate Change and Health, WHO, Geneva, Switzerland
| | - Richard B Johnston
- Department of Environmental, Climate Change and Health, WHO, Geneva, Switzerland
| | - Andrew Mertens
- Division of Epidemiology and Biostatistics, School of Public Health, University of California, Berkeley, CA, USA
| | - Annette Prüss-Ustün
- Department of Environmental, Climate Change and Health, WHO, Geneva, Switzerland
| | - Ian Ross
- Department of Disease Control, Faculty of Infectious Tropical Disease, London School of Hygiene & Tropical Medicine, London, UK
| | - Jeffrey Stanaway
- Institute for Health Metrics and Evaluation, University of Washington, Seattle, WA, USA
| | - Jeff T Zhao
- Institute for Health Metrics and Evaluation, University of Washington, Seattle, WA, USA
| | - Oliver Cumming
- Department of Disease Control, Faculty of Infectious Tropical Disease, London School of Hygiene & Tropical Medicine, London, UK
| | - Sophie Boisson
- Department of Environmental, Climate Change and Health, WHO, Geneva, Switzerland
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17
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Ensemble Machine Learning Model to Predict the Waterborne Syndrome. ALGORITHMS 2022. [DOI: 10.3390/a15030093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The COVID-19 epidemic has highlighted the significance of sanitization and maintaining hygienic access to clean water to reduce mortality and morbidity cases worldwide. Diarrhea is one of the prevalent waterborne diseases caused due to contaminated water in many low-income countries with similar living conditions. According to the latest statistics from the World Health Organization (WHO), diarrhea is among the top five primary causes of death worldwide in low-income nations. The condition affects people in every age group due to a lack of proper water used for daily living. In this study, a stacking ensemble machine learning model was employed against traditional models to extract clinical knowledge for better understanding patients’ characteristics; disease prevalence; hygienic conditions; quality of water used for cooking, bathing, and toiletries; chemicals used; therapist’s medications; and symptoms that are reflected in the field study data. Results revealed that the ensemble model provides higher accuracy with 98.90% as part of training and testing phases when experimented against frequently used J48, Naïve Bayes, SVM, NN, PART, Random Forest, and Logistic Regression models. Managing outcomes of this research in the early stages could assist people in low-income countries to have a better lifestyle, fewer infections, and minimize expensive hospital visits.
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Lord J, Thomas A, Treat N, Forkin M, Bain R, Dulac P, Behroozi CH, Mamutov T, Fongheiser J, Kobilansky N, Washburn S, Truesdell C, Lee C, Schmaelzle PH. Global potential for harvesting drinking water from air using solar energy. Nature 2021; 598:611-617. [PMID: 34707305 PMCID: PMC8550973 DOI: 10.1038/s41586-021-03900-w] [Citation(s) in RCA: 55] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Accepted: 08/11/2021] [Indexed: 11/09/2022]
Abstract
Access to safely managed drinking water (SMDW) remains a global challenge, and affects 2.2 billion people1,2. Solar-driven atmospheric water harvesting (AWH) devices with continuous cycling may accelerate progress by enabling decentralized extraction of water from air3-6, but low specific yields (SY) and low daytime relative humidity (RH) have raised questions about their performance (in litres of water output per day)7-11. However, to our knowledge, no analysis has mapped the global potential of AWH12 despite favourable conditions in tropical regions, where two-thirds of people without SMDW live2. Here we show that AWH could provide SMDW for a billion people. Our assessment-using Google Earth Engine13-introduces a hypothetical 1-metre-square device with a SY profile of 0.2 to 2.5 litres per kilowatt-hour (0.1 to 1.25 litres per kilowatt-hour for a 2-metre-square device) at 30% to 90% RH, respectively. Such a device could meet a target average daily drinking water requirement of 5 litres per day per person14. We plot the impact potential of existing devices and new sorbent classes, which suggests that these targets could be met with continued technological development, and well within thermodynamic limits. Indeed, these performance targets have been achieved experimentally in demonstrations of sorbent materials15-17. Our tools can inform design trade-offs for atmospheric water harvesting devices that maximize global impact, alongside ongoing efforts to meet Sustainable Development Goals (SDGs) with existing technologies.
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Affiliation(s)
- Jackson Lord
- X, The Moonshot Factory, Mountain View, CA, USA.
| | | | - Neil Treat
- X, The Moonshot Factory, Mountain View, CA, USA
| | | | - Robert Bain
- WHO/UNICEF Joint Monitoring Programme, Division of Data, Analytics, Planning and Monitoring, UNICEF, New York, NY, USA
| | | | | | | | | | | | | | | | - Clare Lee
- X, The Moonshot Factory, Mountain View, CA, USA
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Charles KJ, Greggio E. Invited Perspective: Beyond National Water Quality Surveys: Improving Water Quality Surveillance to Achieve Safe Drinking Water for All (Sustainable Development Goal 6.1). ENVIRONMENTAL HEALTH PERSPECTIVES 2021; 129:91301. [PMID: 34546075 PMCID: PMC8454498 DOI: 10.1289/ehp10064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Revised: 08/27/2021] [Accepted: 08/31/2021] [Indexed: 06/13/2023]
Affiliation(s)
- Katrina J. Charles
- School of Geography and the Environment, University of Oxford, Oxford, UK
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