Andrew S. Ferguson, Alice C. Layton, Brian J. Mailloux, Patricia J. Culligan et al.
Groundwater is routinely analyzed for fecal indicators but direct comparisons of fecal indicators to the presence of bacterial and viral pathogens are rare. This study was conducted in rural Bangladesh where the human population density is high, sanitation is poor, and groundwater pumped from shallo...
Alexander van Geen, Kazi Matin Ahmed, Yasuyuki Tsuboi, Md Jahangir Alam et al.
The health risks of As exposure due to the installation of millions of shallow tubewells in the Bengal Basin are known, but fecal contamination of shallow aquifers has not systematically been examined. This could be a source of concern in densely populated areas with poor sanitation because the hydr...
Peter S.K. Knappett, Verónica Escamilla, Alice C. Layton, Larry D. McKay et al.
A majority of households in Bangladesh rely on pond water for hygiene. Exposure to pond water fecal contamination could therefore still contribute to diarrheal disease despite the installation of numerous tubewells for drinking. The objectives of this study are to determine the predominant sources (...
Jianyong Wu, Alexander van Geen, Kazi Matin Ahmed, Yasuyuki Akita Jahangir Alam et al.
BACKGROUND: Millions of households throughout Bangladesh have been exposed to high levels of arsenic (As) causing various deadly diseases by drinking groundwater from shallow tubewells for the past 30 years. Well testing has been the most effective form of mitigation because it has induced massive s...
Peter S.K. Knappett, Larry D. McKay, Alice C. Layton, Daniel E. Williams et al.
Bangladesh is underlain by shallow aquifers in which millions of drinking water wells are emplaced without annular seals. Fecal contamination has been widely detected in private tubewells. To evaluate the impact of well construction on microbial water quality 35 private tubewells (11 with intact cem...
Peter S.K. Knappett, Larry D. McKay, Alice C. Layton, Daniel E. Williams et al.
Ponds receiving latrine effluents may serve as sources of fecal contamination to shallow aquifers tapped by millions of tube-wells in Bangladesh. To test this hypothesis, transects of monitoring wells radiating away from four ponds were installed in a shallow sandy aquifer underlying a densely popul...
Andrew S. Ferguson, Brian J. Mailloux, Kazi Matin Ahmed, Alexander van Geen et al.
The retention and release of total coliforms and Escherichia coli was investigated in hand-pumps removed from tubewells tapping a faecally contaminated aquifer in Matlab, Bangladesh, and from a new hand-pump deliberately spiked with E. coli. All hand-pumps were connected to reservoirs of sterile wat...
Peter S.K. Knappett, Alice C. Layton, Larry D. McKay, Daniel E. Williams et al.
The goal of this study was to test hollow-fiber ultrafiltration as a method for concentrating in situ bacteria and viruses in groundwater samples. Water samples from nine wells tapping a shallow sandy aquifer in a densely populated village in Bangladesh were reduced in volume approximately 400-fold ...
Jianyong Wu, Alexander van Geen, Kazi Matin Ahmed, Yasuyuki Akita et al.
Background: Millions of households throughout Bangladesh have been exposed to high levels of arsenic (As) causing various deadly diseases by drinking groundwater from shallow tubewells for the past 30 years. Well testing has been the most effective form of mitigation because it has induced massive s...
Alice C. Layton, Archana Chauhan, Daniel E. Williams, Brian J. Mailloux et al.
The contamination of drinking water from both arsenic and microbial pathogens occurs in Bangladesh. A general metagenomic survey of well water and surface water provided information on the types of pathogens present and may help elucidate arsenic metabolic pathways and potential assay targets for mo...
Marc L. Serre, Yasuyuki Akita Jahangir Alam, Michael Emch, Kazi Matin Ahmed et al.
BackgroundMillions of households throughout Bangladesh have been exposed to high levels of arsenic (As) causing various deadly diseases by drinking groundwater from shallow tubewells for the past 30 years. Well testing has been the most effective form of mitigation because it has induced massive swi...
Daniel E. Williams, Gary S. Sayler, Verónica Escamilla, Alice C. Layton et al.
A majority of households in Bangladesh rely on pond water for hygiene. Exposure to pond water fecal contamination could therefore still contribute to diarrheal disease despite the installation of numerous tubewells for drinking. The objectives of this study are to determine the predominant sources (...
A. Ferguson, Alice C. Layton, Brian J. Mailloux, Patricia J. Culligan et al.
Groundwater is routinely analyzed for fecal indicators but direct comparisons of fecal indicators to the presence of bacterial and viral pathogens are rare. This study was conducted in rural Bangladesh where the human population density is high, sanitation is poor, and groundwater pumped from shallo...
Andrew S. Ferguson, Daniel E. Williams, Brian J. Mailloux, Gary S. Sayler et al.
Groundwater is routinely analyzed for fecal indicators but direct comparisons of fecal indicators to the presence of bacterial and viral pathogens are rare. This study was conducted in rural Bangladesh where the human population density is high, sanitation is poor, and groundwater pumped from shallo...
Jie Zhuang, M.R. Huq, Verónica Escamilla, Patricia J. Culligan et al.
Ponds receiving latrine effluents may serve as sources of fecal contamination to shallow aquifers tapped by millions of tube-wells in Bangladesh. To test this hypothesis, transects of monitoring wells radiating away from four ponds were installed in a shallow sandy aquifer underlying a densely popul...
Gary S. Sayler, Peter S.K. Knappett, Kazi Matin Ahmed, Alice C. Layton et al.
Bangladesh is underlain by shallow aquifers in which millions of drinking water wells are emplaced without annular seals. Fecal contamination has been widely detected in private tubewells. To evaluate the impact of well construction on microbial water quality 35 private tubewells (11 with intact cem...
P. Kim Streatfield, Alice C. Layton, Jacob L. Mey, Andrew S. Ferguson et al.
The health risks of As exposure due to the installation of millions of shallow tubewells in the Bengal Basin are known, but fecal contamination of shallow aquifers has not systematically been examined. This could be a source of concern in densely populated areas with poor sanitation because the hydr...