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3. Microbiological diagnostics of bloodstream infections in Europe—an ESGBIES survey

Author

Idelevich, E.A., Seifert, H., Sundqvist, M., Scudeller, L., Amit, S., Balode, A., Bilozor, A., Drevinek, P., Kocak Tufan, Z., Koraqi, A., Lamy, B., Mareković, I., Miciuleviciene, J., Müller Premru, M., Pascual, A., Pournaras, S., Saegeman, V., Schønheyder, H.C., Schrenzel, J., Strateva, T., Tilley, R., Wiersinga, W.J., Zabicka, D., Carmeli, Y., and Becker, K.

Published
2019
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10. Diagnosing pelvic osteomyelitis beneath pressure ulcers in spinal cord injured patients: a prospective study

Author

Alméras, Isabelle, Du Thanh, Aurélie, Gélis, Anthony, Reynaud, Claire, Rouays, Hélène, Trial, Chloé, Fliueraru, Sergio, Herlin, Christian, Lavigne, Jean-Philippe, Delfour, Christophe, Baron, Marie-Pierre, Viala, Pierre, Mura, Thibaut, Géraud, Philippe, Brunel, A.-S., Lamy, B., Cyteval, C., Perrochia, H., Téot, L., Masson, R., Bertet, H., Bourdon, A., Morquin, D., Reynes, J., and Le Moing, V.

Published
2016
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22. Microbiological diagnostics of bloodstream infections in Europe-an ESGBIES survey

Author

Idelevich, E. A., Seifert, H., Sundqvist, M., Scudeller, L., Amit, S., Balode, A., Bilozor, A., Drevinek, P., Tufan, Z. Kocak, Koraqi, A., Lamy, B., Marekovic, I., Miciuleviciene, J., Premru, M. Mueller, Pascual, A., Pournaras, S., Saegeman, V., Schonheyder, H. C., Schrenzel, J., Strateva, T., Tilley, R., Wiersinga, W. J., Zabicka, D., Carmeli, Y., Becker, K., Idelevich, E. A., Seifert, H., Sundqvist, M., Scudeller, L., Amit, S., Balode, A., Bilozor, A., Drevinek, P., Tufan, Z. Kocak, Koraqi, A., Lamy, B., Marekovic, I., Miciuleviciene, J., Premru, M. Mueller, Pascual, A., Pournaras, S., Saegeman, V., Schonheyder, H. C., Schrenzel, J., Strateva, T., Tilley, R., Wiersinga, W. J., Zabicka, D., Carmeli, Y., and Becker, K.

Abstract

Objectives: High-quality diagnosis of bloodstream infections (BSI) is important for successful patient management. As knowledge on current practices of microbiological BSI diagnostics is limited, this project aimed to assess its current state in European microbiological laboratories. Methods: We performed an online questionnaire-based cross-sectional survey comprising 34 questions on practices of microbiological BSI diagnostics. The ESCMID Study Group for Bloodstream Infections, Endocarditis and Sepsis (ESGBIES) was the primary platform to engage national coordinators who recruited laboratories within their countries. Results: Responses were received from 209 laboratories in 25 European countries. Although 32.5% (68/209) of laboratories only used the classical processing of positive blood cultures (BC), two-thirds applied rapid technologies. Of laboratories that provided data, 42.2% (78/185) were able to start incubating BC in automated BC incubators around-the-clock, and only 13% (25/192) had established a 24-h service to start immediate processing of positive BC. Only 4.7% (9/190) of laboratories validated and transmitted the results of identification and antimicrobial susceptibility testing (AST) of BC pathogens to clinicians 24 h/day. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry from briefly incubated sub-cultures on solid media was the most commonly used approach to rapid pathogen identification from positive BC, and direct disc diffusion was the most common rapid AST method from positive BC. Conclusions: Laboratories have started to implement novel technologies for rapid identification and AST for positive BC. However, progress is severely compromised by limited operating hours such that current practice of BC diagnostics in Europe complies only partly with the requirements for optimal BSI management. (C) 2019 European Society of Clinical Microbiology and Infectious Diseases. Published by Elsevier Ltd. All rights reserved.

Published
2019

29. Leech management before application to patient for preventing healthcare-associated infections: results of a nationwide survey

Author

Grau, D., Masson, R., Villiet, Maxime, Lamy, B, Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Hydrosciences Montpellier (HSM), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Pathogènes Hydriques Santé Environnement (PHySE ), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and roussel, pascale

Subjects
[SDV] Life Sciences [q-bio], [SDV]Life Sciences [q-bio], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

30. Delineation of taxonomic species within complex of species: Aeromonas media and related species as a test case

Author

Figueras, M.J., Talagrand-Reboul, E., Roger, F., Kimper, J.-L., Colston, S.M., Graf, J., Latif-Eugenín, F., Petit, F., Marchandin, H., Jumas-Bilak, E., Lamy, B., Unitat de Micologia i Microbiologia Ambiental, Ciències Mèdiques Bàsiques, and Universitat Rovira i Virgili

Subjects
Ciències de la salut, Taxonomia, Integrative taxonomy, Health sciences, Cladistica, Aeromonas, Ciencias de la salud, 1664-302X, Complex of species
Abstract

Aeromonas media is an opportunistic pathogen for human and animals mainly found in aquatic habitats and which has been noted for significant genomic and phenotypic heterogeneities. We aimed to better understand the population structure and diversity of strains currently affiliated to A. media and the related species A. rivipollensis. Forty-one strains were included in a population study integrating, multilocus genetics, phylogenetics, comparative genomics, as well as phenotypics, lifestyle, and evolutionary features. Sixteen gene-based multilocus phylogeny delineated three clades. Clades corresponded to different genomic groups or genomospecies defined by phylogenomic metrics ANI (average nucleotide identity) and isDDH (in silico DNA-DNA hybridization) on 14 whole genome sequences. DL-lactate utilization, cefoxitin susceptibility, nucleotide signatures, ribosomal multi-operon diversity, and differences in relative effect of recombination and mutation (i.e., in evolution mode) distinguished the two species Aeromonas media and Aeromonas rivipollensis. The description of these two species was emended accordingly. The genome metrics and comparative genomics suggested that a third clade is a distinct genomospecies. Beside the species delineation, genetic and genomic data analysis provided a more comprehensive knowledge of the cladogenesis determinants at the root and inside A. media species complex among aeromonads. Particular lifestyles and phenotypes as well as major differences in evolution modes may represent putative factors associated with lineage emergence and speciation within the A. media complex. Finally, the integrative and populational approach presented in this study is considered broadly in order to conciliate the delineation of taxonomic species and the popula

Published
2017
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32. Delineation of taxonomic species within complex of species: Aeromonas media and related species as a test case

Author

Unitat de Micologia i Microbiologia Ambiental, Ciències Mèdiques Bàsiques, Universitat Rovira i Virgili, Figueras, M.J.; Talagrand-Reboul, E.; Roger, F.; Kimper, J.-L.; Colston, S.M.; Graf, J.; Latif-Eugenín, F.; Petit, F.; Marchandin, H.; Jumas-Bilak, E.; Lamy, B., Unitat de Micologia i Microbiologia Ambiental, Ciències Mèdiques Bàsiques, Universitat Rovira i Virgili, and Figueras, M.J.; Talagrand-Reboul, E.; Roger, F.; Kimper, J.-L.; Colston, S.M.; Graf, J.; Latif-Eugenín, F.; Petit, F.; Marchandin, H.; Jumas-Bilak, E.; Lamy, B.

Abstract

Aeromonas media is an opportunistic pathogen for human and animals mainly found in aquatic habitats and which has been noted for significant genomic and phenotypic heterogeneities. We aimed to better understand the population structure and diversity of strains currently affiliated to A. media and the related species A. rivipollensis. Forty-one strains were included in a population study integrating, multilocus genetics, phylogenetics, comparative genomics, as well as phenotypics, lifestyle, and evolutionary features. Sixteen gene-based multilocus phylogeny delineated three clades. Clades corresponded to different genomic groups or genomospecies defined by phylogenomic metrics ANI (average nucleotide identity) and isDDH (in silico DNA-DNA hybridization) on 14 whole genome sequences. DL-lactate utilization, cefoxitin susceptibility, nucleotide signatures, ribosomal multi-operon diversity, and differences in relative effect of recombination and mutation (i.e., in evolution mode) distinguished the two species Aeromonas media and Aeromonas rivipollensis. The description of these two species was emended accordingly. The genome metrics and comparative genomics suggested that a third clade is a distinct genomospecies. Beside the species delineation, genetic and genomic data analysis provided a more comprehensive knowledge of the cladogenesis determinants at the root and inside A. media species complex among aeromonads. Particular lifestyles and phenotypes as well as major differences in evolution modes may represent putative factors associated with lineage emergence and speciation within the A. media complex. Finally, the integrative and populational approach presented in this study is considered broadly in order to conciliate the delineation of taxonomic species and the popula

Published
2017

35. Stenotrophomonas maltophilia healthcare-associated infections: identification of two main pathogenic genetic backgrounds

Author

Corlouer, C., primary, Lamy, B., additional, Desroches, M., additional, Ramos-Vivas, J., additional, Mehiri-Zghal, E., additional, Lemenand, O., additional, Delarbre, J-M., additional, Decousser, J-W., additional, Aberanne, S., additional, Belmonte, O., additional, Blondiaux, N., additional, Cattoir, V., additional, Dekeyser, S., additional, Delarbre, J.M., additional, Jaouen, A.C., additional, Laurens, E., additional, Parisi Duchene, E., additional, Pangon, B., additional, Plassart, C., additional, Picot, S., additional, and Vachee, A., additional

Published
2017
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36. Caractérisation génétique des clones de Stenotrophomonas maltophilia responsables d’infections chez l’animal : un nouveau réservoir pour l’homme?

Author

Jayol, A., Haenni, M., Maillard, K., Desroches, M., Lamy, B., Jumas-Bilak, Estelle, J.Y., Madec, Decousser, J.W., Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Ecologie des systèmes marins côtiers (Ecosym), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS), Hydrosciences Montpellier (HSM), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), roussel, pascale, and Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.STU.HY] Sciences of the Universe [physics]/Earth Sciences/Hydrology, [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2014

37. An Analysis of Antibiotic Resistance in the Aeromonas population of the Medicinal Leech

Author

Beka, L, Fullmer, M., Colston, S., Nelson, M.C., Ford, B, Walker, P., Lamy, B, Gogarten, J.P., Graf, J, Hydrosciences Montpellier (HSM), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Centre méditerranéen de médecine moléculaire (C3M), Université Nice Sophia Antipolis (... - 2019) (UNS), and COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Côte d'Azur (UCA)

Subjects
[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2014

38. Tracing evolution in Aeromonas: the roles of shared ancestry and shared genes in niche adaptation

Author

Gogarten, J.P., Fullmer, M., Colston, Sophie, Beka, L., Lamy, B., Graf, J., Hydrosciences Montpellier (HSM), and Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDV]Life Sciences [q-bio], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2014

39. Aeromonas media embraces at least two clearly species

Author

Talagrand, Emilie, J.-P., Kimper, F, Roger, M.-J, Figueras, Colston, S., M, Marchandin, Kodjo, A., Graf, J, Jumas-Bilak, Estelle, Lamy, B, Hydrosciences Montpellier (HSM), and Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2014

40. Synergistic pathogenic effect of Aeromonas strains co-infecting Caenorhabditis elegans

Author

Mosser, Thomas, Talagrand, Emilie, Jumas-Bilak, Estelle, Lamy, B., Hydrosciences Montpellier (HSM), and Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDV]Life Sciences [q-bio], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2014

41. New Insights from Comparative Genomic Approaches about Aeromonas Infections, Evolution and Taxonomy

Author

Graf, J., Beka, L., Colston, Sophie, Fullmer, M., Lamy, B., Gogarten, J.P., Hydrosciences Montpellier (HSM), and Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDV]Life Sciences [q-bio], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2014

42. Diversité d’Aeromonas media : quel impact taxonomique ?

Author

Talagrand, Emilie, Kimper, Jean-Luc, Roger, F., Figueras, M.J., Marchandin, H., Jumas-Bilak, Estelle, Lamy, B., roussel, pascale, Hydrosciences Montpellier (HSM), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), and Société Française de Microbiologie (SFM)

Subjects
[SDU.STU.HY] Sciences of the Universe [physics]/Earth Sciences/Hydrology, [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2014

43. Automated versus manual sample inoculation in routine clinical microbiology: evaluation of the performance of the full automatic (FA) Inoqula instrument

Author

Froment, P., Marchandin, H., Vande Perre, P., Lamy, B., Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Hydrosciences Montpellier (HSM), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Pathogénèse et contrôle des infections chroniques (PCCI), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre Hospitalier Universitaire de Montpellier (CHU Montpellier )-Université de Montpellier (UM), and Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Montpellier (UM)-Centre Hospitalier Universitaire de Montpellier (CHU Montpellier )

Subjects
[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology
Abstract

International audience; The process of plate streaking has been automated to improve the culture readings, isolation quality, and workflow of microbiology laboratories. However, instruments have not been well evaluated under routine conditions. We aimed to evaluate the performance of the fully automated InoqulA instrument (BD Kiestra B.V., The Netherlands) in the automated seeding of liquid specimens and samples collected using swabs with transport medium. We compared manual and automated methods according to the (i) within-run reproducibility using Escherichia coli-calibrated suspensions, (ii) intersample contamination using a series of alternating sterile broths and broths with >105 CFU/ml of either E. coli or Proteus mirabilis, (iii) isolation quality with standardized mixed bacterial suspensions of diverse complexity and a 4-category standardized scale (very poor, poor, fair to good, or excellent), and (iv) agreement of the results obtained from 244 clinical specimens. By involving 15 technicians in the latter part of the comparative study, we estimated the variability in the culture quality at the level of the laboratory team. The instrument produced satisfactory reproducibility with no sample cross-contamination, and it performed better than the manual method, with more colony types recovered and isolated (up to 11% and 17%, respectively). Finally, we showed that the instrument did not shorten the seeding time over short periods of work compared to that for the manual method. Altogether, the instrument improved the quality and standardization of the isolation, thereby contributing to a better overall workflow, shortened the time to results, and provided more accurate results for polymicrobial specimens.

Published
2014

45. Diagnosing pelvic osteomyelitis beneath pressure ulcers in spinal cord injured patients: a prospective study

Author

Brunel, A.-S., primary, Lamy, B., additional, Cyteval, C., additional, Perrochia, H., additional, Téot, L., additional, Masson, R., additional, Bertet, H., additional, Bourdon, A., additional, Morquin, D., additional, Reynes, J., additional, Le Moing, V., additional, Alméras, Isabelle, additional, Du Thanh, Aurélie, additional, Gélis, Anthony, additional, Reynaud, Claire, additional, Rouays, Hélène, additional, Trial, Chloé, additional, Fliueraru, Sergio, additional, Herlin, Christian, additional, Lavigne, Jean-Philippe, additional, Delfour, Christophe, additional, Baron, Marie-Pierre, additional, Viala, Pierre, additional, Mura, Thibaut, additional, and Géraud, Philippe, additional

Published
2016
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46. Exposure to pairs of Aeromonas strains enhances virulence in the Caenorhabditis elegans infection model

Author

Universitat Rovira i Virgili, Mosser T, Talagrand-Reboul E, Colston SM, Graf J, Figueras MJ, Jumas-Bilak E, Lamy B., Universitat Rovira i Virgili, and Mosser T, Talagrand-Reboul E, Colston SM, Graf J, Figueras MJ, Jumas-Bilak E, Lamy B.

Abstract

Aeromonad virulence remains poorly understood, and is difficult to predict from strain characteristics. In addition, infections are often polymicrobial (i.e., are mixed infections), and 5-10% of such infections include two distinct aeromonads, which has an unknown impact on virulence. In this work, we studied the virulence of aeromonads recovered from human mixed infections. We tested them individually and in association with other strains with the aim of improving our understanding of aeromonosis. Twelve strains that were recovered in pairs from six mixed infections were tested in a virulence model of the worm Caenorhabditis elegans. Nine isolates were weak worm killers (median time to death, TD50, ≥7 days) when administered alone. Two pairs showed enhanced virulence, as indicated by a significantly shortened TD50 after co-infection vs. infection with a single strain. Enhanced virulence was also observed for five of the 14 additional experimental pairs, and each of these pairs included one strain from a natural synergistic pair. These experiments indicated that synergistic effects were frequent and were limited to pairs that were composed of strains belonging to different species. The genome content of virulence-associated genes failed to explain virulence synergy, although some virulence-associated genes that were present in some strains were absent from their companion strain (e.g., T3SS). The synergy observed in virulence when two Aeromonas isolates were co-infected stresses the idea that consideration should be given to the fact that infection does not depend only on single strain virulence but is instead the result of a more complex interaction between the microbes involved, the host and the environment. These results are of interest for other diseases in which mi

Published
2015

47. Validation of a partial rpoB gene sequence as a tool for phylogenetic identification of aeromonads isolated from environmental sources

Author

Lamy, B. L. B., Laurent, F. L. F., Kodjo, Angeli, Lyon 1, Depot 1, Laboratoire d'Ecologie Microbienne - UMR 5557 (LEM), Institut National de la Recherche Agronomique (INRA)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Ecole Nationale Vétérinaire de Lyon (ENVL)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Centre National de la Recherche Scientifique (CNRS), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Ecole Nationale Vétérinaire de Lyon (ENVL)

Subjects
[SDV] Life Sciences [q-bio], [SDV]Life Sciences [q-bio], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2010

50. [From prevalence to predictive values: considerations on the antimicrobial susceptibility testing dealing with change of susceptibility rates]

Author

Lamy B, Carret G, Jp, Flandrois, Marie Laure Delignette-Muller, Bioinformatique, phylogénie et génomique évolutive (BPGE), Département PEGASE [LBBE] (PEGASE), Laboratoire de Biométrie et Biologie Evolutive - UMR 5558 (LBBE), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Centre National de la Recherche Scientifique (CNRS)-Laboratoire de Biométrie et Biologie Evolutive - UMR 5558 (LBBE), and Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
MESH: Microbial Sensitivity Tests, MESH: Humans, MESH: Bacterial Infections, MESH: Probability, [SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE], MESH: Disease Susceptibility, Bacterial Infections, Microbial Sensitivity Tests, [SDV.BID.SPT]Life Sciences [q-bio]/Biodiversity/Systematics, Phylogenetics and taxonomy, [SDV.BIBS]Life Sciences [q-bio]/Quantitative Methods [q-bio.QM], [SDV.MP.BAC]Life Sciences [q-bio]/Microbiology and Parasitology/Bacteriology, MESH: Predictive Value of Tests, [SDV.EE.ECO]Life Sciences [q-bio]/Ecology, environment/Ecosystems, MESH: Computer Simulation, Predictive Value of Tests, Prevalence, Humans, Computer Simulation, Disease Susceptibility, MESH: Prevalence, Probability
Abstract

International audience; The aim of the study was to quantify the influence of the variation of the susceptibility prevalence (frequencies of susceptible, intermediate and resistant isolates) on the predictive value of antimicrobial susceptibility testing reports performed with disk diffusion method, under several scenarios of distinct susceptibility prevalence. Prevalence variation effect was assessed through a modeling approach that enabled to take into account the technical variability and to control prevalence through scenarios. Results show how the prevalence impacts on the disk diffusion performance with level of discrepancies varying with prevalence. The phenomenon may be quantitatively noteworthy for some antimicrobial agents considering the prevalence recorded with time or location, leading to lowered performances. For instance, with amoxicillin+clavulanic acid, predictive values of susceptible and resistant reports varied respectively from 70 to 96 and from 33 to 97 %. For a 18-mm diameter, the probability the isolate is truly susceptible varied from 16 to 73 % according to the prevalence tested. Characteristic of the prevalence effect are described and consequences on zone diameter breakpoint policy raised. They include to (i) reevaluate disk diffusion breakpoint consistency when the prevalence impact is noteworthy and (ii) estimate the consequences of an international harmonized breakpoint policy on prediction quality and appropriate patient management.

Published
2005

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