Impact of population and latrines on fecal contamination of ponds in rural Bangladesh.

Impact of population and latrines on fecal contamination of ponds in rural Bangladesh. Knappett, P. S. K., Escamilla, V., Layton, A., McKay, L. D., Emch, M., Williams, D. E., Huq, R., Alam, J., Farhana, L., Mailloux, B. J., Ferguson, A., Sayler, G. S., Ahmed, K. M., & van Geen, A. The Science of the total environment, 409:3174–3182, August, 2011.
doi abstract bibtex

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 (human or livestock) of fecal pollution in ponds and examine the association between local population, latrine density, latrine quality and concentrations of fecal bacteria and pathogens in pond water. Forty-three ponds were analyzed for E. coli using culture-based methods and E. coli, Bacteroidales and adenovirus using quantitative PCR. Population and sanitation spatial data were collected and measured against pond fecal contamination. Humans were the dominant source of fecal contamination in 79% of the ponds according to Bacteroidales measurements. Ponds directly receiving latrine effluent had the highest concentrations of fecal indicator bacteria (up to 10⁶ Most Probable Number (MPN) of culturable E. coli per 100 mL). Concentrations of fecal indicator bacteria correlated with population surveyed within a distance of 30-70 m (p<0.05) and total latrines surveyed within 50-70 m (p<0.05). Unsanitary latrines (visible effluent or open pits) within the pond drainage basin were also significantly correlated to fecal indicator concentrations (p<0.05). Water in the vast majority of the surveyed ponds contained unsafe levels of fecal contamination attributable primarily to unsanitary latrines, and to lesser extent, to sanitary latrines and cattle. Since the majority of fecal pollution is derived from human waste, continued use of pond water could help explain the persistence of diarrheal disease in rural South Asia.

@Article{Knappett2011,
  author          = {Knappett, Peter S. K. and Escamilla, Veronica and Layton, Alice and McKay, Larry D. and Emch, Michael and Williams, Daniel E. and Huq, R. and Alam, J. and Farhana, Labony and Mailloux, Brian J. and Ferguson, Andy and Sayler, Gary S. and Ahmed, Kazi M. and van Geen, Alexander},
  journal         = {The Science of the total environment},
  title           = {Impact of population and latrines on fecal contamination of ponds in rural Bangladesh.},
  year            = {2011},
  issn            = {1879-1026},
  month           = aug,
  pages           = {3174--3182},
  volume          = {409},
  abstract        = {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 (human or livestock) of fecal pollution in ponds and examine the association between local population, latrine density, latrine quality and concentrations of fecal bacteria and pathogens in pond water. Forty-three ponds were analyzed for E. coli using culture-based methods and E. coli, Bacteroidales and adenovirus using quantitative PCR. Population and sanitation spatial data were collected and measured against pond fecal contamination. Humans were the dominant source of fecal contamination in 79% of the ponds according to Bacteroidales measurements. Ponds directly receiving latrine effluent had the highest concentrations of fecal indicator bacteria (up to 10⁶ Most Probable Number (MPN) of culturable E. coli per 100 mL). Concentrations of fecal indicator bacteria correlated with population surveyed within a distance of 30-70 m (p<0.05) and total latrines surveyed within 50-70 m (p<0.05). Unsanitary latrines (visible effluent or open pits) within the pond drainage basin were also significantly correlated to fecal indicator concentrations (p<0.05). Water in the vast majority of the surveyed ponds contained unsafe levels of fecal contamination attributable primarily to unsanitary latrines, and to lesser extent, to sanitary latrines and cattle. Since the majority of fecal pollution is derived from human waste, continued use of pond water could help explain the persistence of diarrheal disease in rural South Asia.},
  chemicals       = {Sewage, Water Pollutants},
  citation-subset = {IM},
  completed       = {2011-09-20},
  country         = {Netherlands},
  doi             = {10.1016/j.scitotenv.2011.04.043},
  issn-linking    = {0048-9697},
  issue           = {17},
  keywords        = {Adenoviridae, growth & development, isolation & purification; Bacteria, growth & development, isolation & purification; Bangladesh; Environmental Monitoring; Feces; Fresh Water, chemistry, microbiology, virology; Humans; Risk Assessment; Rural Population; Sewage, analysis, microbiology, virology; Water Microbiology; Water Pollutants, analysis; Water Supply, analysis},
  mid             = {NIHMS301437},
  nlm-id          = {0330500},
  owner           = {NLM},
  pii             = {S0048-9697(11)00431-1},
  pmc             = {PMC3150537},
  pmid            = {21632095},
  pubmodel        = {Print-Electronic},
  pubstate        = {ppublish},
  revised         = {2018-11-13},
}

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