Evaluating the Risk of Infection from the Presence of Giardia and Cryptosporidium in Drinking Water

Evaluating the Risk of Infection from the Presence of Giardia and Cryptosporidium in Drinking Water Monte-Carlo simulations were performed in order to quantify the microbiological risk arising from the presence of Giardia and Cryptosporidium in drinking water. A two-year survey of 45 utilities located on a portion of the St. Lawrence River (Quebec, Canada) allowed us to collect the information required for this assessment: parasite occurrence data, treatment performances and daily unboiled water consumption. For a conventional treatment, the mean annual risk of infection with Cryptosporidium was found to be approximately eight times higher than with Giardia. The Monte-Carlo simulations confirm that the clarification process plays an important role in the reduction of the health risk associated with protozoan parasites. In fact, in the case of Cryptosporidium, the impact of chemical disinfectants (O3 or Cl2) appears to be minimal in the cold water treatment conditions prevailing in Quebec. According to the Monte-Carlo simulations, 45% (for conventional treatment+O3) and 51% (for conventional treatment) of individuals are exposed to a risk of infection with Cryptosporidium higher than the proposed USEPA guideline (1 infection per 10[emsp4 ]000 individuals per year). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantitative Microbiology Springer Journals

Evaluating the Risk of Infection from the Presence of Giardia and Cryptosporidium in Drinking Water

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Publisher
Kluwer Academic Publishers
Copyright
Copyright © 2000 by Kluwer Academic Publishers
Subject
Environment; Environmental Engineering/Biotechnology
ISSN
1388-3593
eISSN
1572-9923
D.O.I.
10.1023/A:1010096013265
Publisher site
See Article on Publisher Site

Abstract

Monte-Carlo simulations were performed in order to quantify the microbiological risk arising from the presence of Giardia and Cryptosporidium in drinking water. A two-year survey of 45 utilities located on a portion of the St. Lawrence River (Quebec, Canada) allowed us to collect the information required for this assessment: parasite occurrence data, treatment performances and daily unboiled water consumption. For a conventional treatment, the mean annual risk of infection with Cryptosporidium was found to be approximately eight times higher than with Giardia. The Monte-Carlo simulations confirm that the clarification process plays an important role in the reduction of the health risk associated with protozoan parasites. In fact, in the case of Cryptosporidium, the impact of chemical disinfectants (O3 or Cl2) appears to be minimal in the cold water treatment conditions prevailing in Quebec. According to the Monte-Carlo simulations, 45% (for conventional treatment+O3) and 51% (for conventional treatment) of individuals are exposed to a risk of infection with Cryptosporidium higher than the proposed USEPA guideline (1 infection per 10[emsp4 ]000 individuals per year).

Journal

Quantitative MicrobiologySpringer Journals

Published: Oct 8, 2004

References

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