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group b streptococcus rapid diagnostics

James Patrick McKenna, Ciara Cox, Derek John Fairley, Rachael Burke, Michael D Shields, Alison Watt, Peter Valentine Coyle
PURPOSE: Neonatal infection with Streptococcus agalactiae (Group B streptococcus - GBS) is a life threatening condition which is preventable if colonised 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 which enables the rapid and specific detection of target nucleic acid sequences in clinical material without requirements for extensive sample preparation...
January 24, 2017: Journal of Medical Microbiology
Christina Clarke, Louise O'Connor, Heather Carré-Skinner, Olaf Piepenburg, Terry J Smith
BACKGROUND: Despite the implementation of prevention guidelines, group B Streptococcal (GBS) infection remains a leading cause of sepsis, pneumonia, and meningitis, resulting in significant neonatal morbidity and mortality. Preventive approaches that identify women at risk of transmitting GBS have reduced the incidence of neonatal GBS disease, and dramatically decreased the associated mortality rates. However, there is an on-going requirement for a near-patient diagnostic test for GBS that can be carried out at the time of delivery, ideally in the labour ward setting, particularly for women of unknown GBS colonisation status at the time of delivery...
2016: BMC Microbiology
Kennedy Uadiale, Agatha Bestman, Charity Kamau, Dominique A Caugant, Jane Greig
BACKGROUND: Neisseria meningitidis serogroup C (NmC) has caused outbreaks in Nigeria of increasing size in three consecutive years since 2013. Rapid diagnostic tests (RDTs) for meningitis can facilitate quick identification of the causative pathogen; Pastorex can detect N. meningitidis serogroups A, C (NmC), Y/W135, N. meningitidis serogroup B/Escherichia coli K1, Haemophilus influenzae type b (Hib), Streptococcus pneumoniae, and group B Streptococcus. There is no published field evaluation of Pastorex in the identification of NmC...
July 2016: Transactions of the Royal Society of Tropical Medicine and Hygiene
J Raignoux, M Benard, S Huo Yung Kai, O Dicky, A Berrebi, L Bibet, A-S Chetouani, N Marty, L Cavalie, C Casper, C Assouline-Azogui
INTRODUCTION: Group B streptococcus (GBS) is the most common infectious agent responsible for early-onset bacterial sepsis (EOS) in term newborns. French prevention of perinatal GBS disease guidelines recommend screening for maternal vaginal GBS colonization at the 9th month of pregnancy, and use of intrapartum antibiotic prophylaxis (IAP) in case of detected GBS vaginal colonization. Peripheral bacterial sampling (gastric aspiration, ear, or meconium) and measurement of C-reactive protein (CRP) are performed in asymptomatic newborns in case of infectious risk factors and/or incomplete IAP...
September 2016: Archives de Pédiatrie: Organe Officiel de la Sociéte Française de Pédiatrie
Bobbi S Pritt, Robin Patel, Thomas J Kirn, Richard B Thomson
Nucleic acid amplification tests (NAATs) have frequently been the standard diagnostic approach when specific infectious agents are sought in a clinic specimen. They can be applied for specific agents such as S. pyogenes, or commercial multiplex NAATs for detection of a variety of pathogens in gastrointestinal, bloodstream, and respiratory infections may be used. NAATs are both rapid and sensitive. For many years, S. pyogenes testing algorithms used a rapid and specific group A streptococcal antigen test to screen throat specimens, followed, in some clinical settings, by a throat culture for S...
October 2016: Journal of Clinical Microbiology
M Defez, F Khizar, M Maurin, F Biot, J-C Pons, F Sergent
OBJECTIVES: The objectives were to evaluate and compare the diagnostic accuracy of a rapid real-time PCR assay at the onset of labor with those of the current antenatal culture-based test at 34-38 weeks gestation for group B Streptococcus (GBS) screening. MATERIALS AND METHODS: A prospective study including all pregnant women admitted for delivery after a 34-week gestation period was conducted in October 2012 at the Grenoble University Hospital Centre. A first culture-based GBS screening test was performed between 34 and 38 weeks of gestation followed by a second screening test at the onset of labor, using a real-time PCR Assay and a culture-based method (gold standard) in order to calculate the diagnostic accuracy...
November 2016: Journal de Gynécologie, Obstétrique et Biologie de la Reproduction
Randall J Olsen, Nahuel Fittipaldi, Priyanka Kachroo, Misu A Sanson, S Wesley Long, Kathryn J Como-Sabetti, Chandni Valson, Concepcion Cantu, Ruth Lynfield, Chris Van Beneden, Stephen B Beres, James M Musser
Large hospital-based clinical laboratories must be prepared to rapidly investigate potential infectious disease outbreaks. To challenge the ability of our molecular diagnostics laboratory to use whole-genome sequencing in a potential outbreak scenario and identify impediments to these efforts, we studied 84 invasive serotype emm59 group A streptococcus (GAS) strains collected in the United States. We performed a rapid-response exercise to the mock outbreak scenario using whole-genome sequencing, genome-wide transcript analysis, and mouse virulence studies...
December 2014: Journal of Clinical Microbiology
Karl G Nicholson, Keith R Abrams, Sally Batham, Marie Jo Medina, Fiona C Warren, Mike Barer, Alison Bermingham, Tristan W Clark, Nicholas Latimer, Maria Fraser, Nelun Perera, K Rajakumar, Maria Zambon
BACKGROUND: Western industrialised nations face a large increase in the number of older people. People over the age of 60 years account for almost half of the 16.8 million hospital admissions in England from 2009 to 2010. During 2009-10, respiratory infections accounted for approximately 1 in 30 hospital admissions and 1 in 20 of the 51.5 million bed-days. OBJECTIVE: To determine the diagnostic accuracy and clinical effectiveness and cost-effectiveness of rapid molecular and near-patient diagnostic tests for influenza, respiratory syncytial virus (RSV) and Streptococcus pneumoniae infections in comparison with traditional laboratory culture...
May 2014: Health Technology Assessment: HTA
Christelle Jost, Béatrice Bercot, Hervé Jacquier, Laurent Raskine, Emmanuel Barranger, Geneviève Mouchnino, Emmanuelle Cambau
The Xpert GBS real-time PCR assay was applied to gastric fluid samples from 143 newborns, and it detected group B streptococcus (GBS) within 1 h for 16 (11.2%) cases, while microscopic examination detected only 2 cases. The sensitivity and specificity of the Xpert GBS were 80% and 100%, respectively, with regard to 20 cases of GBS colonization or infection. Concordance of Xpert GBS results versus culture was 92.3%. This test detects in a timely manner newborns at risk for invasive GBS disease.
February 2014: Journal of Clinical Microbiology
Rana K Daher, Gale Stewart, Maurice Boissinot, Michel G Bergeron
BACKGROUND: Group B streptococcal infections are the leading cause of sepsis and meningitis in newborns. A rapid and reliable method for the detection of this pathogen at the time of delivery is needed for the early treatment of neonates. Isothermal amplification techniques such as recombinase polymerase amplification have advantages relative to PCR in terms of the speed of reaction and simplicity. METHODS: We studied the clinical performance of recombinase polymerase amplification for the screening of group B streptococci in vaginal/anal samples from 50 pregnant women...
April 2014: Clinical Chemistry
I A Ba-Saddik, A A Munibari, A M Alhilali, S M Ismail, F M Murshed, J B S Coulter, L E Cuevas, C A Hart, B J Brabin, C M Parry
OBJECTIVES: To estimate the prevalence of Group A beta-haemolytic streptococcus (GAS) and non-GAS infections among children with acute pharyngotonsillitis in Aden, Yemen, to evaluate the value of a rapid diagnostic test and the McIsaac score for patient management in this setting and to determine the occurrence of emm genotypes among a subset of GAS isolated from children with acute pharyngotonsillitis and a history of acute rheumatic fever (ARF) or rheumatic heart disease (RHD). METHODS: Group A beta-haemolytic streptococcus infections in school-aged children with acute pharyngotonsillitis in Aden, Yemen, were diagnosed by a rapid GAS antigen detection test (RADT) and/or GAS culture from a throat swab...
April 2014: Tropical Medicine & International Health: TM & IH
Adam B Olson, Heather Kent, Christopher D Sibley, Margot E Grinwis, Philip Mabon, Claude Ouellette, Shari Tyson, Morag Graham, Shaun D Tyler, Gary Van Domselaar, Michael G Surette, Cindi R Corbett
BACKGROUND: The Streptococcus Anginosus Group (SAG) represents three closely related species of the viridans group streptococci recognized as commensal bacteria of the oral, gastrointestinal and urogenital tracts. The SAG also cause severe invasive infections, and are pathogens during cystic fibrosis (CF) pulmonary exacerbation. Little genomic information or description of virulence mechanisms is currently available for SAG. We conducted intra and inter species whole-genome comparative analyses with 59 publically available Streptococcus genomes and seven in-house closed high quality finished SAG genomes; S...
December 17, 2013: BMC Genomics
Saeed Tajbakhsh, Marjan Norouzi Esfahani, Mohammad Emaneini, Niloofar Motamed, Elham Rahmani, Somayyeh Gharibi
BACKGROUND: Pregnant women colonized by Streptococcus agalactiae (group B streptococci [GBS]) may transfer this microorganism to their newborns. S. agalactiae is an important cause of pneumonia, sepsis, and meningitis in newborns. Fluorescent in situ hybridization (FISH) is considered as a method of identification in the field of diagnostic microbiology. In this paper, we have designed a study to compare the DNA FISH after 7 h Lim broth enrichment and culturing for the identification of S...
2013: BMC Infectious Diseases
H B Mohamed, H A Alif, A A Awadalla, Z L Azza
Appropriate, rapid and reliable laboratory tests are essential for the diagnosis and therapy of acute bacterial meningitis especially in children. The purpose of this study was to evaluate the diagnostic value of flowcytometric detection of CD64 surface marker on blood neutrophils in diagnosis of acute bacterial meningitis. Our work included 132 (74 males and 58 females) patients with suspected meningitis, whose ages ranged from 2 months to 11 year. Patients were subjected to full clinical examination, complete blood count (CBC), cerebrospinal fluid (CSF) chemical and bacteriological analysis and detection of CD64 surface marker on blood neutrophils (CD64+ leucocytes)...
2012: Egyptian Journal of Immunology
Jonathan Faro
No abstract text is available yet for this article.
June 2013: MLO: Medical Laboratory Observer
Stéphane Emonet, Jacques Schrenzel, Begoña Martinez de Tejada
Group B streptococci (GBS) are a leading cause of infectious neonatal morbidity and mortality. Timely and accurate identification of colonized pregnant women is imperative to implement intrapartum antibioprophylaxis (IAP) to reduce the risk of early neonatal sepsis. Current guidelines recommend screening for GBS carriage with vaginal-rectal cultures. However, cultures require 24-72 h, thus precluding their use for intrapartum screening and these are only performed at 35-37 weeks gestation. New rapid molecular-based tests can detect GBS within hours...
December 2013: Molecular Diagnosis & Therapy
E Poncelet-Jasserand, F Forges, M-N Varlet, C Chauleur, P Seffert, C Siani, B Pozzetto, A Ros
OBJECTIVE: To assess whether the determination of the presence of group B streptococci (GBS) in the vagina using a rapid polymerase chain reaction (PCR) assay at delivery was able to spare useless antimicrobial treatments, as compared with conventional culture at 34-38 weeks of gestation. DESIGN: Practical evaluation and prospective cost-effectiveness analysis. SETTING: A university hospital in France. POPULATION: A cohort of 225 women in labour at the University-Hospital of Saint-Etienne...
August 2013: BJOG: An International Journal of Obstetrics and Gynaecology
Nadege Bourgeois-Nicolaos, Anne-Gael Cordier, Christelle Guillet-Caruba, François Casanova, Alexandra Benachi, Florence Doucet-Populaire
The Xpert GBS real-time PCR assay for the detection of group B streptococci (GBS) in antepartum screening samples was evaluated on amniotic fluid samples collected from 139 women with premature rupture of membrane at term. When any intrapartum positive result from the Xpert GBS or culture was considered a true positive, the sensitivities of the Xpert GBS and culture were 92.3% and 84.6%, respectively. This assay could enhance exact identification of candidates for intrapartum antibiotic prophylaxis.
April 2013: Journal of Clinical Microbiology
Jeong Su Park, Dong-Hee Cho, Jae Hyug Yang, Moon Young Kim, Son Moon Shin, Eui-Chong Kim, Sung Sup Park, Moon-Woo Seong
BACKGROUND: Group B streptococcus (GBS) infection is a leading cause of neonatal morbidity and mortality worldwide. Here, we present the analytical and diagnostic usefulness of a new real-time PCR-based assay (Xpert GBS; Cepheid, USA) for rapid and accurate prenatal GBS screening. METHODS: We enrolled 175 pregnant women who were between 35 and 39 weeks of gestation. The analytical performance of the Xpert GBS assay was first tested using a reference GBS strain. Next, to test diagnostic performance, rectovaginal swabs were obtained from pregnant women who visited the hospital for regular antenatal screening after 34 weeks of gestation...
January 2013: Annals of Laboratory Medicine
Jonathan P Faro, Karen Bishop, Gerald Riddle, Allan Katz, Sebastian Faro
We analyzed the performance of a new rapid diagnostic test for use in determining group B streptococcus colonization in pregnancy. Vaginal-rectal specimens were compared by the rapid test, a commercial laboratory culture result, and an in-house culture. Of 150 patient samples, 72 were positive by the rapid test, giving a prevalence of 48.0% versus 24.7% by traditional culture. Characterization of these results showed cross-reactivity with Enterococcus. The addition of bacitracin reduced this interference, and when reanalyzed, a colonization rate of 31...
July 2012: Diagnostic Microbiology and Infectious Disease
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