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Appl Environ Microbiol. 1988 October; 54(10): 2580-2582

Inactivation of Giardia lamblia and Giardia canis cysts by combined and free chlorine.

Department of Pathobiology, College of Veterinary Medicine, Auburn University, Alabama 36849-5312.

ABSTRACT

Free chlorine and a combined organic N-chloramine (3-chloro-4,4-dimethyl-2-oxazolidinone, compound 1) were compared for efficacy as disinfectants against an admixture of cysts of Giardia lamblia and Giardia canis in water solution under a variety of test conditions; variables were pH, temperature, and water quality. In general, compound 1 was found to reduce the giardial excystation in the solutions at lower concentration or shorter contact time at a given total chlorine concentration than did free chlorine.