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Journal of Clinical Microbiology, 10 1995, 2592-2595, Vol 33, No. 10
Copyright © 1995 by the American Society for Microbiology. All rights reserved.

Effect of three concentration techniques on viability of Cryptosporidium parvum oocysts recovered from bovine feces

Z Bukhari and HV Smith
Scottish Parasite Diagnostic Laboratory, Stobhill NHS Trust, Springburn, Glasgow, Scotland.

Bovine fecal samples (1 g) negative for Cryptosporidium sp. oocysts were seeded with 7 x 10(4) Cryptosporidium parvum oocysts and purified by either water-ether concentration, sucrose density flotation, or zinc sulfate flotation to evaluate oocyst recovery. The effect of these purification techniques on the viability of recovered oocysts was also evaluated. Significantly higher numbers of seeded oocysts were recovered by water-ether concentration (recovery rate, 46 to 75%) than by sucrose density (24 to 65%) or zinc sulfate (22 to 41%) flotation methods. In addition, water-ether concentration did not exert a significant effect on the viability of the population of oocysts recovered, whereas sucrose density flotation and zinc sulfate flotation selectively concentrated viable oocysts. The water-ether concentration procedure is recommended for use in epidemiological studies in which both oocyst enumeration and viability assessment are required.

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