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A comparison of two approaches to extracting Cryptosporidium DNA from human stools as measured by a real-time PCR
K Elwin1, G Robinson, S J Hadfield
1UK Cryptosporidium Reference Unit, Public Health Wales Microbiology, Singleton Hospital, Swansea, SA2 8QA, United Kingdom.
Abstract:
Direct extraction of Cryptosporidium DNA from 46 stools by bead-beating, guanidine thiocyanate and silica purification provided slightly lower PCR positivity (93.5% vs. 100%) and higher threshold cycle values (mean 34.93 vs. 28.03; P=0.00) than spin-column extraction from boiled, semi-purified oocyst suspensions. However, direct extraction is cheaper, and amenable to automation.
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