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Coenye T. Biofilm antimicrobial susceptibility testing: where are we and where could we be going? Clin Microbiol Rev 2023; 36:e0002423. [PMID: 37812003 PMCID: PMC10732061 DOI: 10.1128/cmr.00024-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Accepted: 07/27/2023] [Indexed: 10/10/2023] Open
Abstract
Our knowledge about the fundamental aspects of biofilm biology, including the mechanisms behind the reduced antimicrobial susceptibility of biofilms, has increased drastically over the last decades. However, this knowledge has so far not been translated into major changes in clinical practice. While the biofilm concept is increasingly on the radar of clinical microbiologists, physicians, and healthcare professionals in general, the standardized tools to study biofilms in the clinical microbiology laboratory are still lacking; one area in which this is particularly obvious is that of antimicrobial susceptibility testing (AST). It is generally accepted that the biofilm lifestyle has a tremendous impact on antibiotic susceptibility, yet AST is typically still carried out with planktonic cells. On top of that, the microenvironment at the site of infection is an important driver for microbial physiology and hence susceptibility; but this is poorly reflected in current AST methods. The goal of this review is to provide an overview of the state of the art concerning biofilm AST and highlight the knowledge gaps in this area. Subsequently, potential ways to improve biofilm-based AST will be discussed. Finally, bottlenecks currently preventing the use of biofilm AST in clinical practice, as well as the steps needed to get past these bottlenecks, will be discussed.
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Affiliation(s)
- Tom Coenye
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
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McLeod C, Smyth AR, Messer M, Schultz A, Wood J, Norman R, Blyth CC, Webb S, Elliott Z, Van Devanter D, Stephenson AL, Tong A, Snelling TL. Protocol for establishing a core outcome set for evaluation in studies of pulmonary exacerbations in people with cystic fibrosis. BMJ Open 2022; 12:e056528. [PMID: 36153014 PMCID: PMC9511571 DOI: 10.1136/bmjopen-2021-056528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
INTRODUCTION Pulmonary exacerbations are associated with increased morbidity and mortality in people with cystic fibrosis (CF). There is no consensus about which outcomes should be evaluated in studies of pulmonary exacerbations or how these outcomes should be measured. Outcomes of importance to people with lived experience of the disease are frequently omitted or inconsistently reported in studies, which limits the value of such studies for informing practice and policy. To better standardise outcome reporting and measurement, we aim to develop a core outcome set for studies of pulmonary exacerbations in people with CF (COS-PEX) and consensus recommendations for measurement of core outcomes. METHODS AND ANALYSIS Preliminary work for development of COS-PEX has been reported, including (1) systematic reviews of outcomes and methods for measurement reported in existing studies of pulmonary exacerbations; (2) workshops with people affected by CF within Australia; and (3) a Bayesian knowledge expert elicitation workshop with health professionals to ascertain outcomes of importance. Here we describe a protocol for the additional stages required for COS-PEX development and consensus methods for measurement of core outcomes. These include (1) an international two-round online Delphi survey and (2) consensus workshops to review and endorse the proposed COS-PEX and to agree with methods for measurement. ETHICS AND DISSEMINATION National mutual ethics scheme approval has been provided by the Child and Adolescent Health Service Human Research Ethics Committee (RGS 4926). Results will be disseminated via consumer and research networks and peer-reviewed publications. This study is registered with the Core Outcome Measures in Effectiveness Trials database.
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Affiliation(s)
- Charlie McLeod
- Wesfarmers Centre of Vaccines and Infectious Diseases, Telethon Kids Institute, Perth, Western Australia, Australia
- Infectious Diseases Department, Perth Children's Hospital, Nedlands, Western Australia, Australia
| | - Alan Robert Smyth
- Division of Child Health, Obstetrics and Gynaecology, University of Nottingham, Nottingham, UK
| | - Mitch Messer
- Wesfarmers Centre of Vaccines and Infectious Diseases, Telethon Kids Institute, Perth, Western Australia, Australia
| | - Andre Schultz
- Wal-Yan Respiratory Research Centre, Telethon Kids Institute, The University of Western Australia, Perth, Western Australia, Australia
- Department of Respiratory and Sleep Medicine, Perth Children's Hospital, Nedlands, Western Australia, Australia
| | - Jamie Wood
- Department of Rehabilitation and Human Performance, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Richard Norman
- School of Public Health, Curtin University, Perth, Western Australia, Australia
| | - Christopher C Blyth
- Wesfarmers Centre of Vaccines and Infectious Diseases, Telethon Kids Institute, Perth, Western Australia, Australia
- Infectious Diseases Department, Perth Children's Hospital, Nedlands, Western Australia, Australia
| | - Steve Webb
- Intensive Care Unit, St John of God Health Care, West Perth, Western Australia, Australia
- School of Population Health and Preventive Medicine, Monash University, Melbourne, Victoria, Australia
| | - Zoe Elliott
- Consumer representative, University of Nottingham, Nottingham, UK
| | | | - Anne L Stephenson
- Department of Respirology, St Michael's Hospital, Toronto, Ontario, Canada
| | - Allison Tong
- Centre for Kidney Research, The Children's Hospital at Westmead, Sydney, New South Wales, Australia
| | - Thomas L Snelling
- School of Public Health, The University of Sydney, Sydney, New South Wales, Australia
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De Waele JJ, Boelens J, Van De Putte D, Huis In ‘t Veld D, Coenye T. The Role of Abdominal Drain Cultures in Managing Abdominal Infections. Antibiotics (Basel) 2022; 11:antibiotics11050697. [PMID: 35625341 PMCID: PMC9137968 DOI: 10.3390/antibiotics11050697] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 05/05/2022] [Accepted: 05/17/2022] [Indexed: 02/01/2023] Open
Abstract
Intra-abdominal infections (IAI) are common in hospitalized patients, both in and outside of the intensive care unit. Management principles include antimicrobial therapy and source control. Typically, these infections are polymicrobial, and intra-operative samples will guide the targeted antimicrobial therapy. Although the use of prophylactic abdominal drains in patients undergoing abdominal surgery is decreasing, the use of drains to treat IAI, both in surgical and non-surgical strategies for abdominal infection, is increasing. In this context, samples from abdominal drains are often used to assist in antimicrobial decision making. In this narrative review, we provide an overview of the current role of abdominal drains in surgery, discuss the importance of biofilm formation in abdominal drains and the mechanisms involved, and review the clinical data on the use of sampling these drains for diagnostic purposes. We conclude that biofilm formation and the colonization of abdominal drains is common, which precludes the use of abdominal fluid to reliably diagnose IAI and identify the pathogens involved. We recommend limiting the use of drains and, when present, avoiding routine microbiological sampling.
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Affiliation(s)
- Jan J. De Waele
- Department of Intensive Care Medicine, Ghent University Hospital, 9000 Ghent, Belgium
- Department of Internal Medicine and Pediatrics, Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium
- Correspondence: ; Tel.: +32-93-32-62-19; Fax: +32-93-32-49-95
| | - Jerina Boelens
- Department of Medical Microbiology, Ghent University Hospital, 9000 Ghent, Belgium;
- Department of Diagnostic Sciences, Ghent University, 9000 Ghent, Belgium
| | - Dirk Van De Putte
- Department of Gastrointestinal Surgery, Ghent University Hospital, 9000 Ghent, Belgium;
| | - Diana Huis In ‘t Veld
- Department of Internal Medicine and Infectious Diseases, Ghent University Hospital, 9000 Ghent, Belgium;
| | - Tom Coenye
- Laboratory of Pharmaceutical Microbiology, Ghent University, 9000 Ghent, Belgium;
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Novel Structures of Functionalized Graphene Oxide with Hydrazide: Characterization and Bioevaluation of Antimicrobial and Cytocompatibility Features. COATINGS 2021. [DOI: 10.3390/coatings12010045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Graphite was oxidized to graphene oxide and activated by thionyl chloride, for further covalently linking three hydrazides with potential biological activity. The obtained materials were characterized by scanning electron microscopy with energy dispersive spectroscopy, Fourier-transform infrared and Raman spectroscopies. The presence of various functional groups specific to graphene oxide (GO) functionalized with different hydrazides was confirmed by spectral data. The ratio between D- and G-bands, observed in Raman spectra, allowed for an evaluation of the disorder degree and the mean crystallite size of the samples. The micrographs highlighted that the samples lead to the occurrence of disorders, probably caused by the sp3 carbons, the formation of oxygen-containing functional groups in the basal planes, and by various structural defects. The new graphene oxide–hydrazide derivatives were tested for their antimicrobial and cytotoxicity activity. Their antimicrobial activity against planktonic and biofilm-embedded cells was inferior to that of free hydrazides, except for GO-3 against planktonic Escherichia coli and GO-2 against Pseudomonas aeruginosa biofilm, demonstrating that further optimization is needed to be able to exploit the huge potential of GO for developing potent antimicrobials.
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