1
|
Grohs P, Picard S, Mainardi JL, Podglajen I. Assessment of version 2.5 of QMAC-dRAST for rapid antimicrobial susceptibility testing with reduced sample-to-answer turnaround time and an integrated expert system. Infect Dis Now 2021; 51:470-476. [PMID: 34366083 DOI: 10.1016/j.idnow.2020.10.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 10/29/2020] [Indexed: 12/14/2022]
Abstract
OBJECTIVE To assess the performance of the new rapid antimicrobial susceptibility testing (AST) QMAC-dRAST V2.5 system. METHODS ASTs were performed using QMAC-dRAST-V2.5 and a disk diffusion method, directly from positive blood bottles with Gram-negative bacteria. Discrepancies between the results obtained using the two methods were categorized into very major errors (VME, S with dRAST vs. R with disk diffusion), major errors (ME, R vs. S, respectively), minor errors (mE, S vs. I or I vs. R, respectively), and very minor errors (Vme, I vs. S or R vs. I, respectively). For each AST, results were recorded after 4, 5, and 6h of incubation. RESULTS From 106 bacteremia, 1416 individual AST results were obtained. Overall agreement between results using the two methods was 91%, ranging from 76.9% to 99.1% depending upon the antibiotic, with 128 errors, i.e. 14/1416 (1%) VME, 59/1416 (4.2%) ME, 25/1416 (1.8%) mE and 30/1416 (2.1%) Vme. VMEs were encountered for Klebsiellasp and Serratia marcescens isolates with low-level piperacillin and amikacin resistance, respectively. Using the integrated QMAC-dRAST-V2.5 expert system, all 14 VMEs and 3 mEs were eliminated, leading to 92.2% categorical agreement. After 45min of pre-incubation in the QMAC-dRAST-V2.5 device, 22.2% of the 1416 AST results were obtained after 4h, an additional 31.4% after 5h and a further 46.3% after 6h. CONCLUSION QMAC-dRAST-V2.5 is an optimized version of QMAC-dRAST V2.0, particularly with respect to utilization of an expert system and reduced TAT according to the antibiotic tested.
Collapse
Affiliation(s)
- Patrick Grohs
- Microbiology department, Georges-Pompidou European Hospital, AP-HP, Centre - Université de Paris, Paris, France.
| | - Simon Picard
- Microbiology department, Georges-Pompidou European Hospital, AP-HP, Centre - Université de Paris, Paris, France
| | - Jean-Luc Mainardi
- Microbiology department, Georges-Pompidou European Hospital, AP-HP, Centre - Université de Paris, Paris, France
| | - Isabelle Podglajen
- Microbiology department, Georges-Pompidou European Hospital, AP-HP, Centre - Université de Paris, Paris, France
| |
Collapse
|
2
|
Durand C, Boudet A, Lavigne JP, Pantel A. Evaluation of Two Methods for the Detection of Third Generation Cephalosporins Resistant Enterobacterales Directly From Positive Blood Cultures. Front Cell Infect Microbiol 2020; 10:491. [PMID: 33014900 PMCID: PMC7516202 DOI: 10.3389/fcimb.2020.00491] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Accepted: 08/06/2020] [Indexed: 12/22/2022] Open
Abstract
Due to the importance of a rapid determination of patients infected by multidrug resistant bacteria, we evaluated two rapid diagnostic tests for the detection of third-generation cephalosporins (3GC)-resistant Enterobacterales directly from positive blood cultures within 1 h: BL-REDTM (electrochemical method) and β-LACTATM test (chromogenic method). A panel of 150 clinical strains characterized for their resistance profiles (e.g., penicillinases, extended-spectrum beta-lactamases (ESBLs), overproduction of cephalosporinase, carbapenemases, impermeability) was tested. Approximately 100 CFU of each isolate was spiked into sterile blood culture bottles and incubated in a BD BACTECTM FX automated system (Becton Dickinson, USA). Positive blood cultures were examined to parallel testing using the BL-REDTM and β-LACTATM tests and conventional susceptibility method (disc diffusion following EUCAST recommendations). For all phenotypes combined, the sensitivity, specificity, positive predictive value, and negative predictive value in the detection of 3GC resistance were, respectively (i) with BL-REDTM: 45.7, 100, 100, and 54.2% and (ii) with β-LACTATM test: 52.2, 100, 100, and 56.9%. The positivity of tests allows to adapt antibiotic treatment whereas the negative result requires other tests. Moreover, these tests detect most Ambler class A-producing Enterobacterales (KPC, ESBL, extended-spectrum OXY) with sensitivities and specificities of 87.5 and 99% for BL-REDTM, respectively and both 100% for β-LACTATM test (47/47 isolates). These two rapid tests failed to detect AmpC overexpressed (sensitivities of 2.7% for BL-REDTM and 0% for β-LACTATM test) and Ambler class B-producing Enterobacterales (sensitivities of 40% for both tests) notably strains without ESBLs associated (sensitivities of 0% for both tests). BL-REDTM and β-LACTATM tests are easy-to-use and mainly attractive when a positive result is obtained notably to detect most of the Ambler class A-producing Enterobacterales in <1 h after the positivity of the blood culture, allowing a rapid adaptation of the antibiotic therapy in patients.
Collapse
Affiliation(s)
- Clarisse Durand
- Service de Microbiologie et Hygiène Hospitalière, CHU Nîmes, Nîmes, France
| | - Agathe Boudet
- VBMI, INSERM U1047, Université de Montpellier, Service de Microbiologie et Hygiène Hospitalière, CHU Nîmes, Nîmes, France
| | - Jean-Philippe Lavigne
- VBMI, INSERM U1047, Université de Montpellier, Service de Microbiologie et Hygiène Hospitalière, CHU Nîmes, Nîmes, France
| | - Alix Pantel
- VBMI, INSERM U1047, Université de Montpellier, Service de Microbiologie et Hygiène Hospitalière, CHU Nîmes, Nîmes, France
| |
Collapse
|
3
|
Grohs P, Rondinaud E, Fourar M, Rouis K, Mainardi JL, Podglajen I. Comparative evaluation of the QMAC-dRAST V2.0 system for rapid antibiotic susceptibility testing of Gram-negative blood culture isolates. J Microbiol Methods 2020; 172:105902. [PMID: 32205178 DOI: 10.1016/j.mimet.2020.105902] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 03/17/2020] [Accepted: 03/17/2020] [Indexed: 11/16/2022]
Abstract
To comparatively evaluate the performance of the rapid antimicrobial susceptibility testing (AST) system QMAC-dRAST V2.0 and of standard disk diffusion in agar, AST was performed directly from 100 positive blood culture bottles with Gram-negative bacilli. AST results provided by QMAC-dRAST showed 92.9% agreement with disk diffusion method results. Discrepancies observed between results obtained with QMAC-dRAST and disk diffusion method conducted to 10 very major errors (0.8%, S with QMAC-dRAST vs R with disk diffusion method), 40 major errors (3.2%, R vs S, respectively), 15 minor errors (1.2%, S vs I or I vs R, respectively) and 23 very minors errors (1.8%, I vs S or R vs I, respectively). For very major and major errors, in only 36% of the cases did the repeat QMAC-dRAST confirm the initial result, whereas a repeat AST using disk diffusion method confirmed the initial result in 92% of cases. AST results obtained using microdilution in liquid medium confirmed those obtained with QMAC-dRAST and disk diffusion method in 4% and 89%, respectively. Repeatability and reproducibility tests performed on QMAC-dRAST using reference strains showed 94% to 100% of R/S/I categorical agreement.
Collapse
Affiliation(s)
- Patrick Grohs
- Microbiology department, Georges Pompidou European Hospital, AP-HP-Centre Université de Paris, Université de Paris, Paris, France.
| | - Emilie Rondinaud
- Microbiology department, Georges Pompidou European Hospital, AP-HP-Centre Université de Paris, Université de Paris, Paris, France
| | - Myriam Fourar
- Microbiology department, Georges Pompidou European Hospital, AP-HP-Centre Université de Paris, Université de Paris, Paris, France
| | - Karama Rouis
- Microbiology department, Georges Pompidou European Hospital, AP-HP-Centre Université de Paris, Université de Paris, Paris, France
| | - Jean-Luc Mainardi
- Microbiology department, Georges Pompidou European Hospital, AP-HP-Centre Université de Paris, Université de Paris, Paris, France
| | - Isabelle Podglajen
- Microbiology department, Georges Pompidou European Hospital, AP-HP-Centre Université de Paris, Université de Paris, Paris, France
| |
Collapse
|
4
|
Bouza E, Muñoz P, Burillo A. Role of the Clinical Microbiology Laboratory in Antimicrobial Stewardship. Med Clin North Am 2018; 102:883-898. [PMID: 30126578 DOI: 10.1016/j.mcna.2018.05.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
For adequate antimicrobial stewardship, microbiology needs to move from the laboratory to become physically and verbally amenable to the caregivers of an institution. Herein, we describe the contributions of our microbiology department to the antimicrobial stewardship program of a large teaching hospital as 10 main points ranging from the selection of patients deemed likely to benefit from a fast track approach, to their clinical samples, or the rapid reporting of results via a microbiology hotline, to rapid searches for pathogens and susceptibility testing. These points should serve as guidelines for similar programs designed to decrease the unnecessary use of antimicrobials.
Collapse
Affiliation(s)
- Emilio Bouza
- Medicine Department, School of Medicine, Universidad Complutense de Madrid (UCM), Plaza Ramón y Cajal s/n, Madrid 28040, Spain; Instituto de Investigación Sanitaria Gregorio Marañón, Doctor Esquerdo, 46, Madrid 28007, Spain; Department of Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Doctor Esquerdo 46, Madrid 28007, Spain; CIBER de Enfermedades Respiratorias (CIBERES CB06/06/0058), Doctor Esquerdo 46, Madrid 28007, Spain.
| | - Patricia Muñoz
- Medicine Department, School of Medicine, Universidad Complutense de Madrid (UCM), Plaza Ramón y Cajal s/n, Madrid 28040, Spain; Instituto de Investigación Sanitaria Gregorio Marañón, Doctor Esquerdo, 46, Madrid 28007, Spain; Department of Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Doctor Esquerdo 46, Madrid 28007, Spain; CIBER de Enfermedades Respiratorias (CIBERES CB06/06/0058), Doctor Esquerdo 46, Madrid 28007, Spain
| | - Almudena Burillo
- Medicine Department, School of Medicine, Universidad Complutense de Madrid (UCM), Plaza Ramón y Cajal s/n, Madrid 28040, Spain; Instituto de Investigación Sanitaria Gregorio Marañón, Doctor Esquerdo, 46, Madrid 28007, Spain; Department of Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Doctor Esquerdo 46, Madrid 28007, Spain
| |
Collapse
|
5
|
Mizrahi A, Amzalag J, Couzigou C, Péan De Ponfilly G, Pilmis B, Le Monnier A. Clinical impact of rapid bacterial identification by MALDI-TOF MS combined with the bêta-LACTA™ test on early antibiotic adaptation by an antimicrobial stewardship team in bloodstream infections. Infect Dis (Lond) 2018; 50:668-677. [DOI: 10.1080/23744235.2018.1458147] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
Affiliation(s)
- A. Mizrahi
- Laboratoire de Microbiologie clinique, Groupe Hospitalier Paris Saint-Joseph, Paris, France
| | - J. Amzalag
- Laboratoire de Microbiologie clinique, Groupe Hospitalier Paris Saint-Joseph, Paris, France
| | - C. Couzigou
- Equipe mobile de Microbiologie clinique, Groupe Hospitalier Paris Saint-Joseph, Paris, France
| | - G. Péan De Ponfilly
- Laboratoire de Microbiologie clinique, Groupe Hospitalier Paris Saint-Joseph, Paris, France
| | - B. Pilmis
- Equipe mobile de Microbiologie clinique, Groupe Hospitalier Paris Saint-Joseph, Paris, France
| | - A. Le Monnier
- Laboratoire de Microbiologie clinique, Groupe Hospitalier Paris Saint-Joseph, Paris, France
| |
Collapse
|