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Prevalence and distribution of Cryptosporidium and Giardia in wastewater and the surface, drinking and ground waters in the Lower Rhine, Germany

  • C. GALLAS-LINDEMANN (a1) (a2), I. SOTIRIADOU (a1) (a3), J. PLUTZER (a4) and P. KARANIS (a1)
Abstract
SUMMARY

Samples from different water sources (n = 396) were collected during 2009 and 2011. Wastewater (2–5 l) was purified by aluminium sulphate flocculation. Surface, ground and drinking waters (400–6400 l) were collected by filtration. Cryptosporidium oocysts and Giardia cysts were further concentrated by sucrose centrifugation. (Oo)cysts were identified by IFT (immunofluorescence test), DAPI (4′,6-diamidino-2-phenylindole) staining and DICM (difference interference contrast microscopy). Out of 206 wastewater samples, 134 (65·0%) were found to be positive for Giardia cysts and 64 (31·1%) for Cryptosporidium oocysts. Parasite numbers ranged from 0 to 2436 cysts/l and 0 to 1745 oocysts/l. Eight (4·2%) surface and drinking water samples (n = 190) were found to be positive for Giardia cysts (0–56000/100 l), and 18 (9·5%) for Cryptosporidium oocysts (2400/100 l). The purpose of this study was to establish the prevalence and concentrations of Giardia lamblia and Cryptosporidium spp. by detecting (oo)cysts from water samples. This study provides substantial evidence that G. lamblia cysts and Cryptosporidium spp. oocysts are able to enter and circulate in the aquatic environment with negative implications for public health.

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*Authors for correspondence: Prof. Dr. P. Karanis, Dipl-Biol, or C. Gallas-Lindemann, Laboratory for Medical and Molecular Parasitology, University of Cologne, Medical School Josef-Stelzmann-Str. 9, D-50937 Köln. Germany. (Email: Panagiotis.Karanis@uk-koeln.de)
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Epidemiology & Infection
  • ISSN: 0950-2688
  • EISSN: 1469-4409
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