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Time and Temperature Effects on the Viability and Infectivity of Cryptosporidium parvum Oocysts in Chlorinated Tap Water
Authors:Xunde Li  Philippe Brasseur  Patrice Agnamey  Jean Jacques Ballet  Chu Clemenceau
Affiliation:1. Laboratory of Medical Parasitology, Faculty of Medicine-Pharmacy , Rouen, France;2. Laboratory of Immunology and Immunopathology, and UPRES-EA 2128
Abstract:The authors compared the viability and infectivity of Cryptosporidium parvum oocysts in chlorinated tap water at various storage durations (i.e., 2 wk, 4 wk, 6 wk, or 8 wk) and at 2 cool temperatures (i.e., 10[ddot]C and 4[ddot]C), using in vitro (excystation) and in vivo (suckling mouse) methods. After 8 wk, mean oocyst excystation decreased to 33.4% and 26.7% at 10[ddot]C and 4[ddot]C, respectively. Suckling mice infectivity was higher after storage at 10[ddot]C than after storage at 4[ddot]C. These data suggest that Cryptosporidium parvum oocysts can survive and remain infectious for 8 wk in cool chlorinated tap water.
Keywords:cryptosporidiosis  Cryptosporidium parvum  oocysts  suckling mouse  tap water  waterborne parasites
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