%0 Journal Article %A McKenna, James Patrick %A Cox, Ciara %A Fairley, Derek John %A Burke, Rachael %A Shields, Michael D %A Watt, Alison %A Coyle, Peter Valentine %T Loop-mediated isothermal amplification assay for rapid detection of Streptococcus agalactiae (group B streptococcus) in vaginal swabs – a proof of concept study %D 2017 %J Journal of Medical Microbiology, %V 66 %N 3 %P 294-300 %@ 1473-5644 %R https://doi.org/10.1099/jmm.0.000437 %K Streptococcus agalactiae %K loop-mediated isothermal amplification %K rapid detection %I Microbiology Society, %X Purpose. Neonatal sepsis caused by Streptococcus agalactiae [group B streptococcus (GBS)] is a life-threatening condition, which is preventable if colonized mothers are identified and given antibiotic prophylaxis during labour. Conventional culture is time consuming and unreliable, and many available non-culture diagnostics are too complex to implement routinely at point of care. Loop-mediated isothermal amplification (LAMP) is a method that, enables the rapid and specific detection of target nucleic acid sequences in clinical materials without the requirement for extensive sample preparation. Methodology. A prototype LAMP assay targeting GBS sip gene is described. Results. The assay was 100 % specific for GBS, with a limit of detection of 14 genome copies per reaction. The clinical utility of the LAMP assay for rapid direct molecular detection of GBS was determined by testing a total of 157 vaginal swabs with minimal sample processing using a rapid lysis solution. Compared to a reference quantitative real-time PCR assay, the direct LAMP protocol had a sensitivity and specificity of 95.4 and 100 %, respectively, with positive and negative predictive values of 100 and 98.3 %, respectively. Positive and negative likelihood ratios were infinity and 0.05, respectively. The direct LAMP method required a mean time of 45 min from the receipt of a swab to generation of a confirmed result, compared to 2 h 30 min for the reference quantitative real-time PCR test. Conclusion. The direct LAMP protocol described is easy to perform, facilitating rapid and accurate detection of GBS in vaginal swabs. This test has a potential for use at point of care. %U https://www.microbiologyresearch.org/content/journal/jmm/10.1099/jmm.0.000437