Occurrence of Cryptosporidium oocysts in sewage effluents and correlation with microbial,chemical and physical water variables |
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Authors: | Bonadonna Lucia Briancesco Rossella Ottaviani Massimo Veschetti Enrico |
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Affiliation: | (1) Laboratorio di Igiene Ambientale, Istituto Superiore di Sanitá, Roma, Italy;(2) Laboratorio di Igiene Ambientale, Reparto di Microbiologia Ambientale, Istituto Superiore di Sanitá, Viale Regina Elena, Roma, Italy |
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Abstract: | Contaminated water are recognized as a potential source of Cryptosporidium oocysts. In Italy studies on the environmentalspread of the parasite are still scarce even if a high frequencyof serological responses could suggest high rates of endemic Cryptosporidium infections. In this investigation theoccurrence of the parasite in water samples from a municipalwastewater treatment plant was monitored with the aim to evaluatepossible correlation between oocysts and bacterial indicators,pathogens and physico-chemical parameters using a multivariateanalysis. Data collected showed high numbers of oocysts, with ahigh percentage of positive samples and a significant correlationwith pH, redox potential and total organic carbon. No correlationwas found between Cryptosporidium concentration and that of the other microrganisms. The results, through a probing statistical analysis, show that none of the selected microrganisms was a reliable predictor of the presence of theparasite. |
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Keywords: | chemical parameters Cryptosporidium indicators of faecal contamination pathogens water quality |
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