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FeedsFarm.com > EFFECTS OF SPIKING PROCEDURES AND WATER QUALITY ON RECOVERY OF CRYPTOSPORIDIUM IN STREAM WATER USING USEPA METHOD 1623

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EFFECTS OF SPIKING PROCEDURES AND WATER QUALITY ON RECOVERY OF CRYPTOSPORIDIUM IN STREAM WATER USING USEPA METHOD 1623

17th Nov 2005, 23:35 GMT

U.S.EPA Methods 1622 and 1623 are used to detect and quantify Cryptosporidium oocysts in water. The protocol consists of filtration, immunomagnetic separation (IMS), staining with a fluorescent antibody, and microscopic analysis. Microscopic analysis includes detection by fluorescent antibody and confirmation by the demonstration of 1-4 sporozoites or nuclei after staining with 4',6-diamidino-2-phenyl indole dihydrochloride (DAPI). The purpose of this study was to evaluate a new IMS dissociation, a 10 minute incubation at 80 C. Heat dissociation improved the average oocyst recovery from 41% to 71% in seeded reagent water, and from 10% to 51% in seeded river samples. The average DAPI confirmation rate improved from 49 % to 93% in reagent water, and from 48% to 73% in river samples. This modification improved both oocyst recovery and confirmation.

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