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The ReSSQ CMV assay is a novel commercially available kit for quantification of cytomegalovirus (CMV), based on real-time PCR with a peptide nucleic acid probe coupled with a single dye. In combination with the LightCycler, the ReSSQ CMV assay was evaluated with respect to specificity, PCR inhibition, linearity, reproducibility, and sensitivity. All nontested CMV materials were negative, and the assay was not inhibited by the use of different anticoagulants or other factors that may influence blood samples. The dynamic range was between 10 and 5 x 10(8) copies/PCR, and intra- and interassay variabilities were below 0.10 and 0.12 log10 standard deviations, respectively. Assay sensitivity was validated by analysis of 24 samples from a proficiency panel and by comparison to a nested in-house CMV PCR and the COBAS AMPLICOR CMV MONITOR test, using 159 clinical samples. Results from the proficiency panel were well in accordance with input values over the entire range of viral concentrations tested (50 to 31,250 copies/ml). The association between the ReSSQ CMV assay and the in-house PCR was in agreement in 90% of the clinical samples, and discordant results were found for all types of sample materials analyzed. The ReSSQ CMV and COBAS AMPLICOR assays showed no significant differences for samples containing &gt;1,000 CMV copies/ml, but results differed to a greater extent at lower viral concentrations. The results demonstrate that the ReSSQ CMV assay is a CMV-specific, robust, and reproducible method and hence is well suited for routine use in clinical virology laboratories.

journal of clinical microbiology

Evaluation of the ReSSQ Assay in Relation to the COBAS AMPLICOR CMV MONITOR Test and an In-House Nested PCR Method for Detection of Cytomegalovirus DNA