Comparison of Xpert GBS v. culture for rapid detection of group B streptococcus in pregnant women : sensitivity, specificity and predictive values

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dc.contributor.author Said, Mohamed
dc.contributor.author Dangor, Yusuf
dc.contributor.author Mbelle, Nontombi Marylucy
dc.contributor.author Sihlabela, A.
dc.contributor.author Lekalakala, M.R.
dc.contributor.author Ismail, Farzanah
dc.date.accessioned 2019-07-31T11:32:18Z
dc.date.available 2019-07-31T11:32:18Z
dc.date.issued 2018-12
dc.description The research described in this article was an MMed project of MS, the main author. en_ZA
dc.description.abstract BACKGROUND. Group B streptococcus (GBS) is a leading cause of invasive disease, particularly in newborns. Seventy-five percent of neonates will be colonised by mothers carrying the organism. Confirmation of maternal colonisation with GBS is essential for prompt treatment and prevention of neonatal sepsis. The current gold standard of culture for isolation of GBS has a disadvantage of long turnaround time (24 - 72 hours). Rapid assays are required to determine maternal carriage of GBS. OBJECTIVES. To determine the usefulness of the Xpert GBS technology v. culture methods to detect GBS carriage in pregnant women. METHODS. This was a prospective observational study of 284 pregnant women between 26 and 37 weeks’ gestation. Two vaginorectal swabs were collected from each participant. One swab was processed using the gold-standard culture method, while the second swab was processed using the Xpert GBS assay. The performance of the Xpert GBS assay was then compared with that of the culture method. RESULTS. Two swabs were processed from each of 284 pregnant women between 26 and 37 weeks’ gestation. Culture detected 70 GBS isolates from a total of 279 specimens (25.1%), whereas the Xpert GBS detected 66 positive specimens (23.7%). The Xpert GBS assay had a sensitivity of 87% and specificity of 98%, with a positive predictive value of 92% and a negative predictive value of 96%. CONCLUSIONS. The Xpert GBS assay is a rapid and sensitive tool for prenatal detection of GBS. The assay should ideally be available in every labour ward, where women can be screened for GBS on arrival. en_ZA
dc.description.department Medical Microbiology en_ZA
dc.description.department Obstetrics and Gynaecology en_ZA
dc.description.librarian am2019 en_ZA
dc.description.sponsorship A National Health Laboratory Services Research Grant (no. 94443) in fulfilment of MS’s MMed project. en_ZA
dc.description.uri http://www.samj.org.za en_ZA
dc.identifier.citation Said, M., Dangor, Y., Mbelle, N. et al. 2018, 'Comparison of Xpert GBS v. culture for rapid detection of group B streptococcus in pregnant women: Sensitivity, specificity and predictive values', South African Medical Journal, vol. 108, no. 12, pp. 1032-1035. en_ZA
dc.identifier.issn 0256-9574 (print)
dc.identifier.issn 2078-5135 (online)
dc.identifier.other 10.7196/SAMJ.2018.v108i12.13079
dc.identifier.uri http://hdl.handle.net/2263/70843
dc.language.iso en en_ZA
dc.publisher Health and Medical Publishing Group en_ZA
dc.rights © 2019, South African Medical Association. All rights reserved. This article is licensed under a Creative Commons Attribution-NonCommercial Works License (CC BY-NC 3.0). en_ZA
dc.subject Invasive disease en_ZA
dc.subject Newborns en_ZA
dc.subject Mothers en_ZA
dc.subject Group B streptococcus (GBS) en_ZA
dc.title Comparison of Xpert GBS v. culture for rapid detection of group B streptococcus in pregnant women : sensitivity, specificity and predictive values en_ZA
dc.type Article en_ZA


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