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Int J Hyg Environ Health. 2014 Mar;217(2-3):335-9. doi: 10.1016/j.ijheh.2013.07.007. Epub 2013 Jul 17.

Sensitivity of free-living amoeba trophozoites and cysts to water disinfectants.

Author information

1
Université de Poitiers, Laboratoire Ecologie et Biologie des Interactions, CNRS UMR 7267, 1 rue Georges Bonnet, 86022 Poitiers Cedex, France.
2
Université de Poitiers, IC2MP, CNRS UMR 7285, 1 rue Marcel Doré, 86022 Poitiers Cedex, France.
3
EDF, Division Recherche et Développement, 6 Quai Watier, 78401 Chatou, France.
4
VERI, Veolia Environnement, Chemin de la digue BP76, 78603 Maisons Laffitte Cedex, France.
5
Université de Poitiers, Laboratoire Ecologie et Biologie des Interactions, CNRS UMR 7267, 1 rue Georges Bonnet, 86022 Poitiers Cedex, France. Electronic address: yann.hechard@univ-poitiers.fr.

Abstract

Free-living amoebae are naturally present in water. These protozoa could be pathogenic and could also shelter pathogenic bacteria. Thus, they are described as a potential hazard for health. Also, free-living amoebae have been described to be resistant to biocides, especially under their cyst resistant form. There are several studies on amoeba treatments but none of them compare sensitivity of trophozoites and cysts from different genus to various water disinfectants. In our study, we tested chlorine, monochloramine and chlorine dioxide on both cysts and trophozoites from three strains, belonging to the three main genera of free-living amoebae. The results show that, comparing cysts to trophozoites inactivation, only the Acanthamoeba cysts were highly more resistant to treatment than trophozoites. Comparison of the disinfectant efficiency led to conclude that chlorine dioxide was the most efficient treatment in our conditions and was particularly efficient against cysts. In conclusion, our results would help to adapt water treatments in order to target free-living amoebae in water networks.

KEYWORDS:

Amoeba; Chlorine; Cyst; Disinfectant; Treatment; Water

PMID:
23932411
DOI:
10.1016/j.ijheh.2013.07.007
[Indexed for MEDLINE]

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