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Inactivation of Cryptosporidium parvum oocysts in finished drinking water by medium-pressure ultraviolet (UV) light was investigated at bench scale using a collimated beam apparatus and at demonstration scale using a UV reactor. Oocyst viability was assessed in vitro (using 4',6-diamidino-2-phenylindole with propidium iodide and maximized in vitro excystation) and in vivo (using neonatal mouse infectivity assays). In vivo bench-scale studies showed

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Edition: Vol. 91 - No. 3 Published: 03/01/1999 Number of Pages: 9 File Size: 1 file , 940 KB