Evaluation of a degenerate primer for the PCR detection of human caliciviruses

Archives of Virology
F Le GuyaderR L Atmar

Abstract

Numerous outbreaks of gastroenteritis have been associated with Norwalk virus and Small Round Structured Viruses (SRSVs). These single-stranded RNA viruses, recently classified in the Caliciviridae, have been divided into three genogroups. Antigenic relationships also have been established among the different strains. As both an in vitro culture system and an animal model are lacking for these viruses, virus detection depends primarily on electron microscopy, immunological assays or molecular detection. In this study we first analyzed the genetic homology of the RNA polymerase region for 40 SRSV strains. From a consensus sequence for these strains, we designed a degenerate oligonucleotide to prime cDNA synthesis from viral RNA. We evaluated the degenerate primer in combination with three previously described primers in PCR reactions. A panel of 15 stools containing SRSVs, typed when possible by solid phase immune electron microscopy (SPIEM), were selected to represent all three genogroups and four different SPIEM antigenic types. Serial dilutions of the purified viral nucleic acids were amplified using the three different primer sets. Virus-specific probes were used to characterize the amplicons obtained. Virus-specific amplico...Continue Reading

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Citations

Sep 6, 2001·Journal of Medical Virology·K VainioB Grinde
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