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Detection and genotyping of Giardia duodenalis in oreto river (Sicily, south Italy)
No full textThe aim of this study was to identify whether the origin of Oreto river Giardia contamination was derived from one of the influents, which flows near Monreale city and receives its treated wastewater, or from livestock living in farms along the river. Genotypes were characterized by DNA sequencing analysis of PCR products of TPI gene. 17 water samples coming from Oreto basin, 20 fecal animal samples and 7 human fecal samples from 3 patients with giardiasis were processed. Cysts were typed as assemblage A (n=11), B (n=2) and A+B (n=4) in water samples, as assemblage A (n=4) and B (n=2) in human samples, while in livestock was found only assemblage E. Subtype AII was prevalent in both water and human samples. This work suggests the need to increase the efficacy of wastewater treatment in order to avoid any further river contamination
Proprietà dei fotocatalizzatori nanostrutturati a base di TiO2: applicazioni sull’inquinamento di acque reflue
No full textVALIDITA' DEL METODO DI IMMUNOFLUORESCENZA DIRETTA NELLA DIAGNOSI DI GIARDIASI IN UN SOGGETTO HIV+
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Molecular Characterization of Giardia duodenalis cysts in the Oreto River (Sicily, Southern Italy)
Full text linkBackground: The presence of Giardia was investigated along the Oreto river between January 2008 and May 2009 with the aim of understanding the source of contamination by molecular typing of cysts. Methods: A total of 38 water samples (10 collected from the river mouth, 24 from the whole Oreto basin and 4 sewage samples from the Monreale treatment plant) were processed. In addition, 22 faecal samples of livestock living close to the Oreto area, were analyzed. The presence of Giardia was determined by immunofluorescence assay and their genetic characterization was achieved by a nested PCR assay targeting the triosephosphate isomerase gene. Results: All water samples from the river mouth were positive for Giardia, even if the concentration of cysts fluctuated considerably among sampling occasions. Our investigation showed that the Vadduneddu and Altofonte torrents, two influents of the river, were the principal sources of contamination. Moreover, the genotypes of Vadduneddu torrent were the same as those detected in human wastewater taken from the activated sludge plant of Monreale city. Assemblages A and B were found in water samples with a predominance of Assemblage A, subtype AII. Assemblage E was only found in a single calf isolate. Conclusions: The data show that the high cyst counts regularly detected in the Oreto river are due to contamination with wastewater of human origin. This finding is relevant for public health, particularly because river water is used for agricultural purpose
Ricerca di Giardia e Cryptosporidium in piscine della città di Palermo: Risultati preliminari
No full textHygienic-sanitary quality of ready-to-eat salad vegetables on sale in the city of Palermo (Sicily).
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