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Effects of ozone and ultraviolet radiation treatments on the infectivity of Toxoplasma gondii oocysts

Permanent URL:
http://handle.nal.usda.gov/10113/35161
File:
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Abstract:
Clinical toxoplasmosis in humans has been epidemiologically linked to the consumption of drinking water contaminated by Toxoplasma gondii oocysts. We evaluated killing of T. gondii oocysts after ultraviolet (UV) or ozone treatments by bioassay in mice and/or cell culture. A 4-log inactivation of the oocyst/sporozoite infectivity was obtained for UV fluences >20mJcm⁻². In contrast, oocysts were not inactivated by ozone with an exposure (Ct) up to 9.4mgminl⁻¹ in water at 20°C. In conclusion, UV treatment can be an effective disinfection method to inactivate T. gondii oocysts in drinking water, but ozone did not show promise in this research.
Author(s):
Dumètre, Aurélien , Le Bras, Caroline , Baffet, Maxime , Meneceur, Pascale , Dubey, J.P. , Derouin, Francis , Duguet, Jean-Pierre , Joyeux, Michel , Moulin, Laurent
Note:
Includes references
Source:
Veterinary parasitology 2008 May 31, v. 153, no. 3-4
Language:
English
Publisher:
Elsevier
Year:
2008
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.