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Nilay Peker, John W A Rossen, Ruud H Deurenberg, Paula C Langereis, Erwin G C Raangs, Jan A Kluytmans, Alexander W Friedrich, Jacobien Veenemans, Bhanu Sinha
Outbreak management of extended spectrum β -lactamase (ESBL)-producing pathogens requires rapid and accurate diagnosis. However, conventional screening is slow and labor-intensive. The vast majority of the screened samples are negative and detection of non-outbreak-related resistant micro-organisms often complicates outbreak management. In a CTX-M-15-producing Escherichia coli outbreak, 149 fecal samples and rectal eSwabs were collected by a cross-sectional survey in a Dutch nursing home. Samples were processed by routine diagnostic methods...
January 11, 2018: Microorganisms
Bharat Gandhi, Richard Summerbell, Tony Mazzulli
The Copan ESwab system was evaluated for its ability to maintain the viability of pathogenic fungi. Tests followed the Clinical and Laboratory Standards Institute (CLSI) document M40-A2 roll-plate method at room and refrigerator temperatures. A system was devised for standardizing homogeneous inoculum suspensions of variously sized conidia and sporangiospores of filamentous fungi. A total of 19 clinical and reference strains were standardized to a 0.5 McFarland turbidity standard with a simple photometer. Corresponding optical densities were measured with a spectrophotometer...
February 2018: Journal of Clinical Microbiology
Thomas Demuyser, Deborah De Geyter, Daisy Van Dorpe, Kristof Vandoorslaer, Ingrid Wybo
Anaerobic infections are difficult to diagnose and treat, because of the often slow in vitro growth, the polymicrobial nature and the increasing antimicrobial resistance. Furthermore because of their fastidiousness, anaerobic bacteria often stay unrecognized in clinical practice. Clinical specimens potentially harboring these species require special handling to permit satisfactory recovery of these potential important pathogens. In a clinical setting, temporary storage and transportation to the laboratory are unavoidable before these specimens can be cultured...
January 2018: Journal of Microbiological Methods
Melanie L Yarbrough, David K Warren, Karen Allen, Dennis Burkholder, Robert Daum, Curtis Donskey, Dennis Knaack, Anthony LaMarca, Larissa May, Loren G Miller, David M Parenti, Lance Peterson, Thean Yen Tan, Raymond Widen, Diana R Hernandez, Donna M Wolk, C A Burnham
Health care-associated methicillin-resistant Staphylococcus aureus (MRSA) infections are a burden on the health care system. Clinical laboratories play a key role in reducing this burden, as the timely identification of MRSA colonization or infection facilitates infection control practices that are effective at limiting invasive MRSA infections. The Xpert MRSA NxG assay recently received FDA clearance for the direct detection of MRSA from nasal swabs. This multicenter study evaluated the clinical performance characteristics of the Xpert MRSA NxG assay with prospectively collected rayon nasal swabs ( n = 1,103) and flocked swab (ESwab) nasal specimens ( n = 846)...
January 2018: Journal of Clinical Microbiology
Suzane Silbert, Alicia Gostnell, Carly Kubasek, Raymond Widen
No abstract text is available yet for this article.
September 2017: Journal of Clinical Microbiology
T F T Rezende, A M Doi, M G Quiles, A C C Pignatari, S Manfrendi, C Grothe, M Taminato, D A Barbosa
BACKGROUND: Carbapenem-resistant organism (CRO) colonization is a serious problem that increases the risk of infection and contributes to dissemination of antimicrobial resistance in healthcare-associated environments. The risk of acquisition and dissemination of CRO is high in chronic renal failure patients and the surveillance culture is recommended as a component of infection control programmes. AIM: To assess colonization by CRO, comparing phenotypic and molecular-based methods of diagnostics, in rectal swabs in a large population of chronic renal failure patients...
June 2017: Journal of Hospital Infection
Sara Frosth, Ulrika König, Ann-Kristin Nyman, Anna Aspán
Dichelobacter nodosus is the principal cause of ovine footrot and strain virulence is an important factor in disease severity. Therefore, detection and virulence determination of D. nodosus is important for proper diagnosis of the disease. Today this is possible by real-time PCR analysis. Analysis of large numbers of samples is costly and laborious; therefore, pooling of individual samples is common in surveillance programs. However, pooling can reduce the sensitivity of the method. The aim of this study was to develop a pooling method for real-time PCR analysis that would allow sensitive detection and simultaneous virulence determination of D...
September 2017: Veterinary Research Communications
Helga Paula, Barbara Tribl, Elisabeth Presterl, Magda Diab-El Schahawi
BACKGROUND: Endoscopes are well-known sources of bacterial transmission in health care facilities offering endoscopy services. The association between multidrug-resistant bacterial infections in patients who had undergone an endoscopic retrograde cholangiopancreatography procedure with reprocessed duodenoscopes has been much discussed. Bacterial contamination of duodenoscopes has been attributed to difficulties with reprocessing these devices, specifically the distal end of the scope, which features a movable forceps elevator...
February 1, 2017: American Journal of Infection Control
H Jacqmin, A Schuermans, S Desmet, J Verhaegen, V Saegeman
The aim of this study was to evaluate retrospectively the performance of the Xpert MRSA assay in routine practice and its current use in the intensive care unit (ICU) setting of our hospital, since a pre-emptive isolation strategy has been applied. A total of 6473 patients were routinely screened with ESwab for methicillin-resistant Staphylococcus aureus (MRSA) using three generations of rapid real-time polymerase chain reaction (PCR) (Cepheid GeneXpert) over three consecutive periods of time. Performance was evaluated using broth enrichment culture as the reference method...
August 2017: European Journal of Clinical Microbiology & Infectious Diseases
C O'Connor, M G Kiernan, C Finnegan, J Powell, L Power, N H O'Connell, C P Dunne
BACKGROUND: The Mid-West of Ireland has higher than average national rates of invasive extended-spectrum beta-lactamase (ESBL) bloodstream infections and carbapenemase-producing Enterobacteriaceae (CPE), with increasing numbers of ESBL isolates detected in community-dwelling patients. AIMS: To conduct a point prevalence study in a convenience sample of the Mid-West population with the aim of determining the extent of ESBL colonisation. METHODS: Utilising anonymised community stool samples that had completed routine analysis, we conducted a point prevalence study over a 4-week period on all samples that met defined inclusion and exclusion criteria...
August 2017: Irish Journal of Medical Science
Jeong Hyun Kim, Seung Min Yoo, Yong Hak Sohn, Chan Hee Jin, Yun Suk Yang, In Taek Hwang, Kwan Young Oh
OBJECTIVE: To investigate the predominant Lactobacillus species types (LSTs) of vaginal microbiota in pregnant Korean women by quantifying five Lactobacillus species and two anaerobes. METHODS: In all, 168 pregnant Korean women under antenatal care at Eulji University Hospital and local clinics were enrolled in the prospective cohort study during pregnancy (10-14 weeks). Vaginal samples were collected with Eswab for Quantitative polymerase chain reaction (qPCR) and stored in a -80 °C freezer...
October 2017: Journal of Maternal-fetal & Neonatal Medicine
C O'Connor, M G Kiernan, C Finnegan, M O'Hara, L Power, N H O'Connell, C P Dunne
Rapid detection of patients with carbapenemase-producing Enterobacteriaceae (CPE) is essential for the prevention of nosocomial cross-transmission, allocation of isolation facilities and to protect patient safety. Here, we aimed to design a new laboratory work-flow, utilizing existing laboratory resources, in order to reduce time-to-diagnosis of CPE. A review of the current CPE testing processes and of the literature was performed to identify a real-time commercial polymerase chain reaction (PCR) assay that could facilitate batch testing of CPE clinical specimens, with adequate CPE gene coverage...
May 4, 2017: Bioengineered
Alexander H Dalpke, Marjeta Hofko, Stefan Zimmermann
Vancomycin-resistant enterococci (VRE) are an important cause of health care-associated infections, resulting in significant mortality and a significant economic burden in hospitals. Active surveillance for at-risk populations contributes to the prevention of infections with VRE. The availability of a combination of automation and molecular detection procedures for rapid screening would be beneficial. Here, we report on the development of a laboratory-developed PCR for detection of VRE which runs on the fully automated Becton Dickinson (BD) Max platform, which combines DNA extraction, PCR setup, and real-time PCR amplification...
September 2016: Journal of Clinical Microbiology
Giovanni Cagnoni, Sara Giordana Rimoldi, Cristina Pagani, Claudio Savi, Fabrizio Stefani, Roberta Terzi, Pietro Olivieri, Giulia Tosi, Carlo Parravicini, Annamaria Di Gregorio, Carlo Antona, Maria Rita Gismondo
BACKGROUND: In 2015 a new device for the collection of mediastinal fluid from patients with deep sternal wound infection (DSWI) in the presence of negative-pressure wound therapy (NPWT) became available. The present study was designed to evaluate whether changing sample collection devices increased micro-organism detection in patients undergoing NPWT. METHODS: During 2013-2014, 207 samples were collected and cultured from NPWT patients (n = 23) to demonstrate the presence of DSWI using reticulated polyurethane sponge culture, a swab, and blood culture...
October 2016: Surgical Infections
Eric T Beck, Blake W Buchan, Garrett C Reymann, Nathan A Ledeboer
Paired nasal swab specimens were collected from patients who were undergoing routine methicillin-resistant Staphylococcus aureus (MRSA) screening prior to elective cardiac or orthopedic procedures. Each patient was swabbed using a traditional wound fiber liquid Stuart swab and an ESwab device, a flocked swab with a modified liquid Amies microbiology transport medium. The two specimens were tested using the Cepheid Xpert SA Nasal Complete assay. Results demonstrated a 95.5% agreement between the ESwab and the FDA-cleared wound fiber swab collection device...
July 2016: Journal of Clinical Microbiology
Suzane Silbert, Talita T Rocchetti, Alicia Gostnell, Carly Kubasek, Raymond Widen
Group B Streptococcus detection directly from Copan ESwab collected samples, using the BD Max GBS assay, was evaluated on receipt in the laboratory and after 24 h at room temperature. Results were compared to those using Lim broth enrichment PCR and culture. No significant difference was observed between 24 h ESwab and Lim broth PCRs.
June 2016: Journal of Clinical Microbiology
Kerin L Tyrrell, Diane M Citron, Eliza S Leoncio, Ellie J C Goldstein
We compared the eSwab system to a swab with an anaerobic transport semisolid agar system for their capacities to maintain the viability of 20 species of fastidious anaerobes inoculated on the bench and held at ambient or refrigerator temperature for 24 or 48 h. On average, both systems maintained similar viabilities among analogous groups of organisms at both temperatures, although there were quantitative differences among some species.
May 2016: Journal of Clinical Microbiology
Monica Yu, Karen Cross, Astrid Petrich, Joel Fish
PURPOSE: Any opening in a medical bed mattress cover may allow bodily fluids to enter the mattress, leading to contamination and potential nosocomial infection. This study's purpose was to assess permeability of crib mattress covers and measure bacterial growth within and on crib mattress surfaces. METHOD: Mattresses were selected randomly from hospital inventory. Bonney's blue dye was applied over mattress covers to assess permeability. Mattress cover surface swabs were acquired from standardized locations...
July 1, 2016: American Journal of Infection Control
Arlo Upton, Liselle Bissessor, Elizabeth Farrell, Stanford T Shulman, Xiaotian Zheng, Diana Lennon
Group A streptococcal (GAS) pharyngitis is a particularly important condition in areas of New Zealand where the incidence of acute rheumatic fever remains unacceptably high. Prompt diagnosis and treatment of GAS pharyngitis are cornerstones of the Rheumatic Fever Prevention Programme, but these are hindered by the turnaround time of culture. Tests with excellent performance and rapid turnaround times are needed. For this study, throat swabs (Copan ESwabs) were collected from schoolchildren self-identifying with a sore throat...
January 2016: Journal of Clinical Microbiology
Joakim Forsell, Satu Koskiniemi, Ida Hedberg, Helén Edebro, Birgitta Evengård, Margareta Granlund
Although PCR offers the potential for sensitive detection of parasites there are several pitfalls for optimal performance, especially when DNA is extracted from a complex sample material such as stool. With the aid of a sensitive inhibitor control in a duplex real-time PCR (qPCR) for identification of Entamoeba histolytica and Entamoeba dispar we have evaluated factors that influenced the performance of the qPCR and have suggested a rationale to be used in the analysis of clinical samples. Pre-PCR processing was found to be of outmost importance for an optimal amplification since inhibitors caused false-negative results when higher amounts of sample were used...
September 2015: Journal of Medical Microbiology
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