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group b streptococcus rapid diagnostics

Caroline H Reuter, Hannah L Palac, Larry K Kociolek, Xiaotian T Zheng, Yusuf Y Chao, Rupal Patel, Sameer J Patel
BACKGROUND: Implementing matrix assisted laser desorption ionization time of flight (MALDI-TOF) and multiplex PCR (mPCR) has been associated with decreased mortality and hospital length of stay in adults, but the impact in pediatrics is less understood. METHODS: This pre-post quasi-experimental study compared antibiotic prescribing for positive blood cultures in patients ≤21 years collected in 2012 (pre-intervention) and in 2015 (after MALDI-TOF/mPCR). Time to effective and optimal antimicrobial therapy were evaluated using Cox proportional hazards regression...
May 10, 2018: Pediatric Infectious Disease Journal
Aurélie Morand, Emmanouil Angelakis, Mehdi Ben Chaabane, Philippe Parola, Didier Raoult, Philippe Gautret
BACKGROUND: Skin infections are among the leading causes of diseases in travelers. Diagnosing pathogens could be difficult. METHOD: We applied molecular assays for the diagnostic of a large collection of skin biopsies and swabs from travelers with suspected skin infections. All samples were tested by qPCR for Coxiella burnetti, Bartonella sp., Rickettsia sp., Borrelia sp., Ehrlichia sp., Tropheryma whipplei, Francisella tularensis, Mycobacteria sp., Staphylococcus aureus, Streptococcus pyogenes, Leishmania spp...
March 2, 2018: Travel Medicine and Infectious Disease
A Curry, G Bookless, K Donaldson, S J Knowles
OBJECTIVES: To prospectively evaluate HiberGene's loop-mediated isothermal amplification (LAMP) assay for detection of group B streptococcus (GBS) in maternal recto-vaginal swabs and compare it with enrichment culture. METHODS: Following ethical approval and informed written consent, two low vaginal and rectal swabs were obtained from 400 pregnant women. One swab was tested for GBS using the rapid LAMP assay (index test), the second swab was tested using enrichment culture (reference standard)...
February 2, 2018: Clinical Microbiology and Infection
A Delabaere, S Curinier, S Ughetto, L Gibold, R Bonnet, A Rossi, D Gallot
OBJECTIVES: To decrease the incidence of early-onset group B streptococcal (GBS) disease, a culture-based screening of all pregnant women at 35-37 weeks is recommended. This gold standard test requires 24-72hours culture. This delay precludes its use for intrapartum screening. This study assesses a new immunoassay, the DIMA test, for identifying GBS-positive patients in the labor ward. MATERIALS AND METHODS: This was a prospective observational study of 195 pregnant women presenting with full-term labor at a single site in France between June and August 2012...
May 2017: Journal of Gynecology Obstetrics and Human Reproduction
Sandhya Ramesh Babu, Rachel McDermott, Irum Farooq, David Le Blanc, Wendy Ferguson, Naomi McCallion, Richard Drew, Maeve Eogan
This pilot study assessed the diagnostic accuracy and potential impact of a rapid PCR-based screening test for the detection of group B Streptococcus (GBS) at the onset of labour for the purpose of optimising intrapartum antibiotic prophylaxis (IAP). Vaginal and rectal swabs from a convenience sample of 158 women were analysed by conventional broth-enriched culture and a rapid PCR test. Overall, GBS carriage was 18.98% by culture and 19.62% by PCR. PCR for the detection of GBS had a sensitivity of 93.1%, specificity of 96...
January 2018: Journal of Obstetrics and Gynaecology: the Journal of the Institute of Obstetrics and Gynaecology
Deirdre L Church, Heather Baxter, Tracie Lloyd, Oscar Larios, Daniel B Gregson
Life-threatening infection in neonates due to group B Streptococcus (GBS) is preventable by screening of near-term pregnant women and treatment at delivery. A total of 295 vaginal-rectal swabs were collected from women attending antepartum clinics in Calgary, Alberta, Canada. GBS colonization was detected by the standard culture method (Strep B Carrot Broth subcultured to blood agar with a neomycin disk) and compared to recovery with Strep Group B Broth (Dalynn Biologicals) subcultured to StrepB Select chromogenic medium (CM; Bio-Rad Laboratories) and the Fast-Track Diagnostics GBS real-time PCR (quantitative PCR [qPCR]) assay (Phoenix Airmid Biomedical Corp...
July 2017: Journal of Clinical Microbiology
James Patrick McKenna, Ciara Cox, Derek John Fairley, Rachael Burke, Michael D Shields, Alison Watt, Peter Valentine Coyle
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...
March 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...
September 22, 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
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