Effect of ultraviolet disinfection of drinking water on the viability of Cryptosporidium parvum oocysts.
Demineralized water was enriched with a known number of Cryptosporidium parvum oocysts obtained from fresh calf feces, which were purified and exposed to ultraviolet (UV) light (15,000 mW/sec) for different lengths of time. Coccidium-free litters of CD-1 neonatal mice then were inoculated intragastrically with the treated water. Seven days postinoculation mice were killed and C. parvum infection prevalence and intensity determined. In mice inoculated with C. parvum-enriched water that had been exposed to UV light for at least 150 min, no infection occurred.
Lorenzo-Lorenzo
M J
MJ
Laboratorio de Parasitología, Facultad de Farmacia, Universidad de Santiago de Compostela, La Coruña, Spain.
Ares-Mazas
M E
ME
Villacorta-Martinez de Maturana
I
I
Duran-Oreiro
D
D
D000818:Animals; D002417:Cattle; D003457:Cryptosporidiosis / Q000517:prevention & control*; D016785:Cryptosporidium parvum / Q000528:radiation effects*; D051379:Mice; D013047:Specific Pathogen-Free Organisms; D014466:Ultraviolet Rays; D014881:Water Supply