Improving GBS Detection with Preincubation
Author Information
Author(s): Sousan Sayahtaheri Altaie, James Bridges, Darius Loghmanee, Amol Lele, Kenneth R. Kahn
Primary Institution: State University of New York at Buffalo
Hypothesis
Does preincubation of cervical swabs in Lim broth improve the performance of the ICON rapid test for detecting group B streptococci?
Conclusion
The ICON assay can achieve 100% sensitivity and specificity for detecting GBS in high-risk mothers within 8 hours when using an enrichment broth and doubling the initial sample size.
Supporting Evidence
- Only 4% of positives were detected by the ICON assay at 2 hours post-enrichment.
- The sensitivity of the ICON assay improved significantly with the use of enrichment broth.
- 100% sensitivity was achieved at 8 hours post-enrichment in high-risk patients.
Takeaway
If doctors use a special broth to grow bacteria before testing, they can find group B strep in pregnant women much faster and more accurately.
Methodology
The study involved three phases testing swabs from maternity patients using both culture methods and the ICON assay at various time points post-incubation.
Limitations
The ICON assay's sensitivity is low for lightly colonized patients, and the study primarily focused on high-risk populations.
Participant Demographics
Maternity patients, including those with preterm labor and preterm premature rupture of membranes.
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