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Charfi R, Guyonnet C, Untrau M, Giacometti G, Paper T, Poyart C, Plainvert C, Tazi A. Performances of two rapid LAMP-based techniques for the intrapartum detection of Group B Streptococcus vaginal colonization. Ann Clin Microbiol Antimicrob 2024; 23:37. [PMID: 38664821 PMCID: PMC11046945 DOI: 10.1186/s12941-024-00695-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Accepted: 04/04/2024] [Indexed: 04/28/2024] Open
Abstract
PURPOSE Group B Streptococcus (GBS) is the leading cause of invasive infections in newborns. The prevention of GBS neonatal disease relies on the administration of an intrapartum antibiotic prophylaxis to GBS-colonized women. In recent years, rapid intrapartum detection of GBS vaginal colonization using real-time nucleic acid amplification tests (NAATs) emerged as an alternative to antenatal culture screening methods. METHODS We compared the performances of two loop-mediated isothermal amplification (LAMP) tests, the Ampliflash® GBS and the PlusLife® GBS tests, to standard culture for GBS detection in vaginal specimens from pregnant women. The study was conducted from April to July 2023 in a French hospital of the Paris area. RESULTS A total of 303 samples were analyzed, including 85 culture-positive samples (28.1%). The Ampliflash® GBS test and the PlusLife® GBS tests gave a result for 100% and 96.3% tests, respectively. The performances of the tests were as follows: sensitivity 87.1% (95% confidence interval (CI) 78.3-92.6) and 98.7% (95% CI 93.0-99.8), specificity 99.1% (95% CI 96.7-99.8), and 91.9% (95% CI 87.3-95.0), respectively. False negative results of the Ampliflash® GBS test correlated with low-density GBS cultures. Time-to-results correlated with GBS culture density only for the PlusLife® GBS test (p < 0.001). CONCLUSION Both techniques provide excellent analytical performances with high sensitivity and specificity together with a short turnaround time and results available in 10 to 35 min. Their potential to further reduce the burden of GBS neonatal disease compared with antenatal culture screening needs to be assessed in future clinical studies.
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Affiliation(s)
- Rym Charfi
- Université Paris Cité, CNRS, INSERM, Institut Cochin, Paris, F-75014, France
- Service de Bactériologie, Centre National de Référence des Streptocoques, Assistance Publique - Hôpitaux de Paris Centre Université Paris Cité, Hôpital Cochin, 27 rue du Faubourg Saint-Jacques, Paris, 75014, France
| | - Cécile Guyonnet
- Université Paris Cité, CNRS, INSERM, Institut Cochin, Paris, F-75014, France
- Service de Bactériologie, Centre National de Référence des Streptocoques, Assistance Publique - Hôpitaux de Paris Centre Université Paris Cité, Hôpital Cochin, 27 rue du Faubourg Saint-Jacques, Paris, 75014, France
- Fédération Hospitalo-Universitaire Fighting Prematurity - FHU Préma, Paris, France
| | | | | | | | - Claire Poyart
- Université Paris Cité, CNRS, INSERM, Institut Cochin, Paris, F-75014, France
- Service de Bactériologie, Centre National de Référence des Streptocoques, Assistance Publique - Hôpitaux de Paris Centre Université Paris Cité, Hôpital Cochin, 27 rue du Faubourg Saint-Jacques, Paris, 75014, France
- Fédération Hospitalo-Universitaire Fighting Prematurity - FHU Préma, Paris, France
| | - Céline Plainvert
- Université Paris Cité, CNRS, INSERM, Institut Cochin, Paris, F-75014, France
- Service de Bactériologie, Centre National de Référence des Streptocoques, Assistance Publique - Hôpitaux de Paris Centre Université Paris Cité, Hôpital Cochin, 27 rue du Faubourg Saint-Jacques, Paris, 75014, France
- Fédération Hospitalo-Universitaire Fighting Prematurity - FHU Préma, Paris, France
| | - Asmaa Tazi
- Université Paris Cité, CNRS, INSERM, Institut Cochin, Paris, F-75014, France.
- Service de Bactériologie, Centre National de Référence des Streptocoques, Assistance Publique - Hôpitaux de Paris Centre Université Paris Cité, Hôpital Cochin, 27 rue du Faubourg Saint-Jacques, Paris, 75014, France.
- Fédération Hospitalo-Universitaire Fighting Prematurity - FHU Préma, Paris, France.
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