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The Increasing Need for Surveillance: Water Sources and Environmental Factors

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Abstract:The outbreaks of giardiosis in the 1980's and the outbreak of cryptosporidiosis in Milwaukee, have demonstrated the susceptibility of public water supplies to contamination with protozoan parasites. Many protozoan parasites are resistant to the levels of residual disinfectant remaining after water treatment. Therefore, if parasitic transmission stages are passed through an initial treatment system, the remaining disinfectant residual may not be sufficient to ensure public safety. Thus, it is imperative that treatment be matched to the severity of the contamination of the source water. Highly contaminated source water must be treated in a manner that is efficacious in inactivating and removing protozoan transmission stages. To determine the level of contamination of source water, several methods have been used or proposed. In addition, the list of protozoa to be detected is also growing, as the incidence of disease from waterborne transmission of a variety of protozoa increases. The methods used to detect protozoa in water have included the Information Collection Rule Method and EPA Method 1623. Other technologies that are being investigated for the detection of protozoa in the environment include molecular methods such as fluorescent in situ hybridization probes, and polymerase chain reaction based assays.

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Citation:Lindquist, H. A. The Increasing Need for Surveillance: Water Sources and Environmental Factors. Presented at Symposium 30: Emerging Food- and Water-borne Protozoan Parasites. 51st Annual Meeting of the American Society of Tropical Medicine and Hygene, Denver, CO, November 10-14, 2002.
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Contact: Mary P. O'Bryant - (919)-541-4871 or obriant.mary@epa.gov
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Division: Microbiological & Chemical Exposure Assessment Division
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Branch: Biohazard Assessment Research Branch
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Product Type: Abstrct/Oral
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Presented: 11/10/2002
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Related Entries:
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Bullet Item Detecting Ccl-Related, Emerging and Regulated Waterborne Human Protozoa for Exposure Assessment
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Last Updated on Monday, October 22, 2007
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