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    Comparison of GeneXpert and Line Probe Assay for Detection of Mycobacterium Tuberculosis and Rifampicin-mono Resistance at the National Tuberculosis Reference Laboratory, Kenya

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    Research article (542.1Kb)
    Publication Date
    2019-10
    Authors
    Aricha, S. A.
    Kingwara, L.
    Mwirigi, N. W.
    Chaba, L.
    Kiptai, T.
    Wahogo, J.
    Otwabe, J. S.
    Onyango, P. O.
    Karanja, M.
    Ayieko, C.
    Matu, S. W.
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    (11 total)
    Type
    Article, Journal
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    Citation

    Aricha SA, Kingwara L, Mwirigi NW, Chaba L, Kiptai T, Wahogo J, Otwabe JS, Onyango PO, Karanja M, Ayieko C, Matu SW. Comparison of GeneXpert and line probe assay for detection of Mycobacterium tuberculosis and rifampicin-mono resistance at the National Tuberculosis Reference Laboratory, Kenya. BMC Infect Dis. 2019 Oct 15;19(1):852. doi: 10.1186/s12879-019-4470-9. PMID: 31615537; PMCID: PMC6794895.

    Abstract/Overview

    Background: The dual challenge of low diagnostic sensitivity of microscopy test and technical challenge of performing a TB culture test poses a problem for case detection and initiation of Tuberculosis (TB) second-line treatment. There is thus need for a rapid, reliable and easily accessible assay. This comparative analysis was performed to assess diagnostic performance characteristics of GeneXpert MTB/RIF and Line Probe Assay (LPA). Methods: Three hundred twenty nine sputum samples of patients across the 47 counties in Kenya suspected to have drug resistant TB were picked and subjected to GeneXpert, LPA and Culture MGIT at the National TB Reference Laboratory. Sensitivity, specificity and predictive values were then determined to assess the performance characteristics of the various assays. Results: Against culture MGIT as the gold standard for TB diagnosis, GeneXpert had a sensitivity, specificity, positive predictive value, and negative predictive value of 78.5, 64.9, 59.4 and 82.2% respectively while LPA had 98.4, 66.0, 65.4 and 98.4%. For diagnosis of rifampicin mono-resistance GeneXpert had a moderate agreement (Kappa 0.59, P < 0.01) (sensitivity 62.50%, specificity 96.50%) while LPA that had almost perfect agreement (Kappa = 0.89, p < 0.01) with a (sensitivity 90.0% and specificity 99.1%). Conclusion: LPA has a better performance characteristic to GeneXpert and an alternative to culture with regards to detection of RIF's mono-resistance. Keywords: Drug-resistant TB; GeneXpert; LPA; Sensitivity; Specificity.

    Subject/Keywords
    LPA; GeneXpert; Sensitivity
    Further Details

    © The Author(s). 2019 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

    Publisher
    BioMed Central
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    https://repository.amref.ac.ke/handle/123456789/715
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    • General - GEN [355]

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