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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/11907

Title: Hepatitis C Virus (HCV) RNA screening and sequencing using dry plasma spots
Authors: Phillips, Richard O.
Geretti, Anna Maria
King, Simon
Adjei-Asante, Kwabena
Appiah, Lambert Tetteh
et. al
Keywords: HCV RNA
Dried plasma spots
Sub-Saharan Africa
Issue Date: Oct-2017
Publisher: Elsevier B.V.
Citation: Elsevier B.V. 97 (2017) 18–21 19
Abstract: Background: HCV RNA screening of large sample repositories provides data on HCV epidemic patterns that may help guide control policies. In resource-limited settings, shipment of frozen samples to molecular laboratory facilities and testing of individual samples may be prohibitively expensive. Objective: Our aim was to detect and sequence HCV RNA in a large HIV-positive cohort from Kumasi, Ghana, using pooled and individual dried plasma spots (DPS) produced from samples stored at −80 °C. Study design: In the validation phase, replicate DPS were prepared with six dilutions (500–10,000 IU/ml) of the 4th International Standard for HCV and tested in three independent experiments. In the testing phase, DPS prepared with plasma samples from 875 HIV-positive subjects were pooled for screening, followed by testing of individual DPS of positive pools. Input from individual DPS was two 6 mm punches; pools comprised two punches from each of five DPS. Genotypes were determined by Sanger sequencing of HCV core and NS5B. Results: With the dilution series, sensitivity of HCV RNA detection was ≥2500 IU/ml. Replicate DPS gave intraassay and inter-assay coefficients of variation ≤1.4%. With the stored samples, HCV RNA was detected in 5/175 DPS pools and in one DPS from each positive pool, yielding a HCV RNA prevalence of 5/875 (0.57%; 95% confidence interval 0.07-1.07%). The five samples were sequenced as HCV genotypes 2l and 2r. Discussion: DPS allowed reproducible HCV RNA detection, and pooling effectively contained the cost and labour of screening a previously untested, low-prevalence cohort. DPS were also suitable for HCV sequencing.
Description: An article published by Elsevier B.V.
URI: http://hdl.handle.net/123456789/11907
Appears in Collections:College of Health Sciences

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