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Giardia Cysts in Tertiary-Treated Wastewater Effluents: Are They Infective?

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Abstract:

The infectivity of Giardia lamblia cysts recovered in primary- and tertiary-treated wastewater reclamation plant effluents was assessed in Mongolian gerbils (Meriones unguiculatus). Infections in gerbils inoculated with cysts from primary effluent concentrates demonstrated the presence of infectious G. lamblia cysts. No infectious cysts were detected by this method in concentrates of tertiary-treated effluents. This study found that determination of cyst concentrations without viability or infectivity assessment may significantly overestimate the potential health risks associated with protozoan cysts in tertiary-treated wastewater effluents.

Keywords: CYSTS; GIARDIA; INFECTIVITY; PATHOGENS; VIABILITY

Document Type: Research Article

DOI: https://doi.org/10.2175/106143002X140341

Publication date: 2002-11-01

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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