Efficacy of activated sludge in removing Cryptosporidium parvum oocysts from sewage.
Primary clarifier effluent (procedure B) and final effluent (procedure A) from a wastewater treatment plant were enriched with Cryptosporidium parvum oocysts obtained from the feces of naturally infected calves. Procedure B samples alone were subjected to a laboratory simulation of activated-sludge treatment. Coccidium-free neonatal CD-1 mice were then inoculated intragastrically with procedure A or procedure B samples. Seven days after inoculation, the intensity of oocyst infection in procedure B mice was 91% less than in procedure A mice (controls).
Villacorta-Martinez de Maturana
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I
Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Santiago de Compostela, La Coruña, Spain.
Ares-Mazás
M E
ME
Duran-Oreiro
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D
Lorenzo-Lorenzo
M J
MJ
D000818:Animals; D002417:Cattle / Q000382:microbiology; D003457:Cryptosporidiosis / Q000517:prevention & control*; D016785:Cryptosporidium parvum / Q000302:isolation & purification / Q000502:physiology*; D051379:Mice; D012722:Sewage; D014865:Waste Disposal, Fluid
D012722:Sewage