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      The effect of selective decontamination on the intestinal microbiota as measured with IS-pro: a taxonomic classification tool applicable for direct evaluation of intestinal microbiota in clinical routine

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          Abstract

          Selective decontamination of the digestive tract (SDD) is aimed at elimination of potential pathogenic microorganisms. In this study, the effect of SDD on gut microbiota was evaluated in a large homogenous group of elective colorectal cancer surgery patients. Rectal swabs were taken from 118 patients undergoing colorectal surgery. These patients were randomly assigned to receive perioperative SDD or to the control group (no SDD). Rectal swabs were taken prior to surgery, 3 days after commencing administration of SDD. Gut microbial profiles were obtained with the IS-pro technique, a standardized microbiota profiling assay applicable in clinical routine. Differences in abundance for different taxonomical groups and diversity between the groups were assessed. Unsupervised and supervised classification techniques were used to assess microbial signatures, differentiating between the SDD group and the control group. Patients in the SDD group had different gut microbial signatures than in the control group, also in phyla that are not a target for SDD. Escherichia coli, Sutterella spp., Faecalibacterium prausnitzii, and Streptococcus spp. were the species that differed the most between the two groups. The SDD group showed clustering into two subgroups. In one subgroup, a decrease in Proteobacteria was observed, whereas the other subgroup showed a shift in Proteobacteria species. This study shows that SDD not only decreases colonization of the gastrointestinal tract with potential pathogenic Gram-negative microorganisms, but also reduces the abundance of normal colonizers of our gastrointestinal system and leads to a shift in total microbiota composition.

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          Enterotypes of the human gut microbiome.

          Our knowledge of species and functional composition of the human gut microbiome is rapidly increasing, but it is still based on very few cohorts and little is known about variation across the world. By combining 22 newly sequenced faecal metagenomes of individuals from four countries with previously published data sets, here we identify three robust clusters (referred to as enterotypes hereafter) that are not nation or continent specific. We also confirmed the enterotypes in two published, larger cohorts, indicating that intestinal microbiota variation is generally stratified, not continuous. This indicates further the existence of a limited number of well-balanced host-microbial symbiotic states that might respond differently to diet and drug intake. The enterotypes are mostly driven by species composition, but abundant molecular functions are not necessarily provided by abundant species, highlighting the importance of a functional analysis to understand microbial communities. Although individual host properties such as body mass index, age, or gender cannot explain the observed enterotypes, data-driven marker genes or functional modules can be identified for each of these host properties. For example, twelve genes significantly correlate with age and three functional modules with the body mass index, hinting at a diagnostic potential of microbial markers.
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            Desulfovibrio bacterial species are increased in ulcerative colitis.

            Debate persists regarding the role of Desulfovibrio subspecies in ulcerative colitis. Combined microscopic and molecular techniques enable this issue to be investigated by allowing precise enumeration of specific bacterial species within the colonic mucous gel. The aim of this study was to combine laser capture microdissection and quantitative polymerase chain reaction to determine Desulfovibrio copy number in crypt-associated mucous gel in health and in acute and chronic ulcerative colitis. Colonic mucosal biopsies were harvested from healthy controls (n = 19) and patients with acute (n = 10) or chronic (n = 10) ulcerative colitis. Crypt-associated mucous gel was obtained by laser capture microdissection throughout the colon. Pan-bacterial 16S rRNA and Desulfovibrio copy number/mm were obtained by polymerase chain reaction at each locus. Bacterial copy numbers were interrogated for correlation with location and disease activity. Data were evaluated using a combination of ordinary linear methods and linear mixed-effects models to cater for multiple interactions. Desulfovibrio positivity was significantly increased in acute and chronic ulcerative colitis at multiple levels within the colon, and after normalization with total bacterial signal, the relative Desulfovibrio load was increased in acute colitis compared with controls. Desulfovibrio counts did not significantly correlate with age, disease duration, or disease activity but interlevel correlations were found in adjacent colonic segments in the healthy control and chronic ulcerative colitis groups. The presence of Desulfovibrio subspecies is increased in ulcerative colitis and the data presented suggest that these bacteria represent an increased percentage of the colonic microbiome in acute ulcerative colitis.
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              Nosocomial infections in adult intensive-care units.

              Nosocomial infections affect about 30% of patients in intensive-care units and are associated with substantial morbidity and mortality. Several risk factors have been identified, including the use of catheters and other invasive equipment, and certain groups of patients-eg, those with trauma or burns-are recognised as being more susceptible to nosocomial infection than others. Awareness of these factors and adherence to simple preventive measures, such as adequate hand hygiene, can limit the burden of disease. Management of nosocomial infection relies on adequate and appropriate antibiotic therapy, which should be selected after discussion with infectious-disease specialists and adapted as microbiological data become available.

                Author and article information

                Contributors
                m.l.m.vandoornschepens@olvg.nl
                Journal
                Eur J Clin Microbiol Infect Dis
                Eur J Clin Microbiol Infect Dis
                European Journal of Clinical Microbiology & Infectious Diseases
                Springer Berlin Heidelberg (Berlin/Heidelberg )
                0934-9723
                1435-4373
                1 October 2022
                1 October 2022
                2022
                : 41
                : 11
                : 1337-1345
                Affiliations
                [1 ]GRID grid.12380.38, ISNI 0000 0004 1754 9227, Department of Medical Microbiology and Infection Control, , Amsterdam UMC, Vrije Universiteit Amsterdam, ; De Boelelaan 1118, PK1X124, Amsterdam, 1081 HZ the Netherlands
                [2 ]GRID grid.440209.b, ISNI 0000 0004 0501 8269, Laboratory of Medical Microbiology, , Onze Lieve Vrouwe Gasthuis, ; Amsterdam, the Netherlands
                [3 ]GRID grid.12380.38, ISNI 0000 0004 1754 9227, Department of Surgery, Amsterdam UMC, , Vrije Universiteit Amsterdam, ; Amsterdam, the Netherlands
                [4 ]GRID grid.414725.1, ISNI 0000 0004 0368 8146, Department of Surgery, , Meander Medical Center, ; Amersfoort, the Netherlands
                [5 ]GRID grid.416219.9, ISNI 0000 0004 0568 6419, Department of Surgery, , Spaarne Gasthuis Hospital, ; Haarlem/Hoofddorp, The Netherlands
                [6 ]GRID grid.12380.38, ISNI 0000 0004 1754 9227, Department of Molecular Cell Biology and Immunology, , Amsterdam UMC, Vrije Universiteit Amsterdam, ; Amsterdam, the Netherlands
                [7 ]Amsterdam Infection & Immunity Institute, Amsterdam, the Netherlands
                [8 ]In Biome, Science Park, 116, Amsterdam, 1081 XG The Netherlands
                [9 ]GRID grid.412966.e, ISNI 0000 0004 0480 1382, Department of Medical Microbiology, , NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Center, ; Maastricht, The Netherlands
                Article
                4483
                10.1007/s10096-022-04483-8
                9556388
                36181564
                3efadaa0-d8ed-4569-ae56-7977edd6487b
                © The Author(s) 2022

                Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 27 July 2021
                : 22 December 2021
                Funding
                Funded by: Dutch Gastrointestinal and Liver Foundation
                Funded by: Spaarne Gasthuis Academy fund
                Categories
                Original Article
                Custom metadata
                © Springer-Verlag GmbH Germany, part of Springer Nature 2022

                Infectious disease & Microbiology
                sdd,microbiota,colorectal cancer surgery,is-pro
                Infectious disease & Microbiology
                sdd, microbiota, colorectal cancer surgery, is-pro

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