9 research outputs found

    Administration of probiotic lactic acid bacteria to modulate fecal microbiome in feedlot cattle

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    Modulation of animal gut microbiota is a prominent function of probiotics to improve the health and performance of livestock. In this study, a large-scale survey to evaluate the effect of lactic acid bacteria probiotics on shaping the fecal bacterial community structure of feedlot cattle during three experimental periods of the fattening cycle (163 days) was performed. A commercial feedlot located in northwestern Argentina was enrolled with cattle fed mixed rations (forage and increasing grain diet) and a convenience-experimental design was conducted. A pen (n = 21 animals) was assigned to each experimental group that received probiotics during three different periods. Groups of n = 7 animals were sampled at 40, 104 and 163 days and these samples were then pooled to one, thus giving a total of 34 samples that were subjected to high-throughput sequencing. The microbial diversity of fecal samples was significantly affected (p < 0.05) by the administration period compared with probiotic group supplementation. Even though, the three experimental periods of probiotic administration induced changes in the relative abundance of the most representative bacterial communities, the fecal microbiome of samples was dominated by the Firmicutes (72-98%) and Actinobacteria (0.8-27%) phyla, while a lower abundance of Bacteroidetes (0.08-4.2%) was present. Probiotics were able to modulate the fecal microbiota with a convergence of Clostridiaceae, Lachnospiraceae, Ruminococcaceae and Bifidobacteriaceae associated with health and growth benefits as core microbiome members. Metabolic functional prediction comparing three experimental administration periods (40, 104 and 163 days) showed an enrichment of metabolic pathways related to complex plant-derived polysaccharide digestion as well as amino acids and derivatives during the first 40 days of probiotic supplementation. Genomic-based knowledge on the benefits of autochthonous probiotics on cattle gastrointestinal tract (GIT) microbiota composition and functions will contribute to their selection as antibiotic alternatives for commercial feedlot

    Functional and genomic characterization of ligilactobacillus salivarius TUCO-L2 isolated from lama glama milk: a promising immunobiotic strain to combat infections

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    Potential probiotic or immunobiotic effects of lactic acid bacteria (LAB) isolated from the milk of the South American camelid llama (Lama glama) have not been reported in published studies. The aim of the present work was to isolate beneficial LAB from llama milk that can be used as potential probiotics active against bacterial pathogens. LAB strains were isolated from llama milk samples. In vitro functional characterization of the strains was performed by evaluating the resistance against gastrointestinal conditions and inhibition of the pathogen growth. Additionally, the adhesive and immunomodulatory properties of the strains were assessed. The functional studies were complemented with a comparative genomic evaluation and in vivo studies in mice. Ligilactobacillus salivarius TUCO-L2 showed enhanced probiotic/immunobiotic potential compared to that of other tested strains. The TUCO-L2 strain was resistant to pH and high bile salt concentrations and demonstrated antimicrobial activity against Gram-negative intestinal pathogens and adhesion to mucins and epithelial cells. L. salivarius TUCO-L2 modulated the innate immune response triggered by Toll-like receptor (TLR)-4 activation in intestinal epithelial cells. This effect involved differential regulation of the expression of inflammatory cytokines and chemokines mediated by the modulation of the negative regulators of the TLR signaling pathway. Moreover, the TUCO-L2 strain enhanced the resistance of mice to Salmonella infection. This is the first report on the isolation and characterization of a potential probiotic/immunobiotic strain from llama milk. The in vitro, in vivo, and in silico investigation performed in this study reveals several research directions that are needed to characterize the TUCO-L2 strain in detail to position this strain as a probiotic or immunobiotic that can be used against infections in humans or animals, including llama.Fil: QuilodrĂĄn Vega, Sandra. Universidad de ConcepciĂłn; ChileFil: AlbarracĂ­n, Leonardo Miguel. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Centro de Referencia para Lactobacilos; Argentina. Universidad Nacional de TucumĂĄn. Facultad de Ciencias Exactas y TecnologĂ­a; Argentina. Tohoku University; JapĂłnFil: Mansilla, Flavia Ivana. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Centro de Referencia para Lactobacilos; Argentina. Tohoku University; JapĂłnFil: Arce, Lorena Paola. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Instituto Superior de Investigaciones BiolĂłgicas. Universidad Nacional de TucumĂĄn. Instituto Superior de Investigaciones BiolĂłgicas; Argentina. Tohoku University; JapĂłnFil: Zhou, Binghui. Tohoku University; JapĂłnFil: Islam, Md Aminul. Tohoku University; JapĂłn. Bangladesh Agricultural University; BangladeshFil: Tomokiyo, Mikado. Tohoku University; JapĂłnFil: Al Kassaa, Imad. Lebanese University. Faculty of Public Health; LĂ­banoFil: Suda, Yoshihito. Miyagi University; JapĂłnFil: Kitazawa, Haruki. Tohoku University; JapĂłnFil: Villena, Julio Cesar. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Centro de Referencia para Lactobacilos; Argentina. Tohoku University; JapĂł

    Optimization of soil bioremediation by a mixed culture of actinobacterias

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    El uso masivo de plaguicidas y la descarga industrial de metales provocan una grave contaminaciĂłn ambiental, afectando los ecosistemas. La biorremediaciĂłn es una tecnologĂ­a de bajo costo y efectiva para el tratamiento de estos ambientes. Un cultivo mixto (CM) formado por las actinobacterias Streptomyces ssp. M7, MC1, A5 y A. tucumanensis AB0, mostrĂł capacidad para remediar muestras de suelo co-contaminado con lindano y Cr(VI). Objetivo: Optimizar la biorremediaciĂłn de suelos contaminados con Cr(VI) y el lindano utilizando el CM, MetodologĂ­a: 1. ConcentraciĂłn Ăłptima de inĂłculo: se usaron 0,5; 1,0; 2,0 o 4,0 g de cĂ©lulas/kg de suelo, con 20% de humedad, 25 ”g/kg de lindano y 50 mg/kg de Cr(VI), se incubaron 14 dĂ­as a 30 ÂșC. 2. Diseño factorial: Factores y niveles evaluados: T: 25, 30, 35 ÂșC; H: 10, 20, 30%; Concentraciones iniciales de Cr(VI): 20, 50, 80 mg/L; y de lindano: 10, 25, 40 mg/L; en 1 y 2 se determinĂł Cr(VI) residual (por AbsorciĂłn AtĂłmica) y lindano residual (por cromatografĂ­a gaseosa). 3. Efectividad del proceso: Bioensayos con Lactuca sativa. Resultados: 1. La concentraciĂłn Ăłptima de inĂłculo fue de 1 g/kg. 2. Se obtuvo un modelo matemĂĄtico adecuado para el estudio de la biorremediaciĂłn por el CM. La mayor remociĂłn de ambos contaminantes se logrĂł a 35 ÂșC y 30% de humedad. 3. En todos los casos se observĂł concordancia entre los valores de remociĂłn obtenidos y los parĂĄmetros evaluados sobre Lactuca sativa (germinaciĂłn, longitud de hipocĂłtilo y radĂ­cula). ConclusiĂłn: El cultivo mixto fue capaz de biorremediar el suelo en las diferentes condiciones ambientales ensayadas, lo que quedĂł demostrado mediante el bioindicador, ya que los efectos tĂłxicos observados se revirtieron parcialmente.Fil: Aparicio, Juan Daniel. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Planta Piloto de Procesos Industriales MicrobiolĂłgicos; ArgentinaFil: Raimondo, Enzo Emanuel. Universidad Nacional de TucumĂĄn. Facultad de BioquĂ­mica, QuĂ­mica y Farmacia; Argentina. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Planta Piloto de Procesos Industriales MicrobiolĂłgicos; ArgentinaFil: Alvarez, Analia. Universidad Nacional de TucumĂĄn. Facultad de Ciencias Naturales e Instituto Miguel Lillo; Argentina. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Planta Piloto de Procesos Industriales MicrobiolĂłgicos; ArgentinaFil: SimĂłn SolĂĄ, MarĂ­a Zoleica. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Planta Piloto de Procesos Industriales MicrobiolĂłgicos; ArgentinaFil: Mansilla, Flavia Ivana. Universidad Nacional de TucumĂĄn. Facultad de BioquĂ­mica, QuĂ­mica y Farmacia; Argentina. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Centro de Referencia para Lactobacilos; ArgentinaFil: Polti, Marta Alejandra. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Planta Piloto de Procesos Industriales MicrobiolĂłgicos; Argentina. Universidad Nacional de TucumĂĄn. Facultad de Ciencias Naturales e Instituto Miguel Lillo; ArgentinaVII Congresso Brasileiro de Defensivos AgrĂ­colas NaturaisPelotasBrasilEmpresa Brasileira de Pesquisa AgropecuĂĄri

    Safety and growth optimization of lactic acid bacteria isolated from feedlot cattle for probiotic formula design

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    In order to eliminate the widespread use of antibiotics in livestock production, the research for alternatives has increased lately. This study examined the safety of 40 lactic acid bacteria (LAB) isolated from bovine feedlot environment and previously selected as potential probiotics. A high sensitivity prevalence to ampicillin (AMP, 100%), gentamicin (GEN, 96.3%), kanamycin (KAN, 96.3%), clindamycin (CLI, 85.2%), chloramphenicol (CHL, 92.6%) and streptomycin (STR, 88.9%) while moderate and high resistance against erythromycin (ERY, 48%) and tetracycline (TET, 79%) respectively, were determined. Feedlot enterococci and pediococci displayed high resistance to CLI, ERY, GEN and TET (73, 100, 54.5, and 73%, respectively). Among fifteen resistance genes investigated, seven were identified in lactobacilli; their presence not always was correlated with phenotypic resistance. STR resistance genes, aadA and ant(6) were observed in 7.4 and 3.7% of isolates, respectively; genes responsible for aminoglycosides resistance, such as bla (7.4%), and aph(3?)-III (3.7%) were also recognized. In addition, resistance cat and tetS genes (3.7 and 7.4%, respectively) were harbored by feedlot lactobacilli strains. The presence of ermB gene in 22.3% of isolates, including two of the six strains phenotypically resistant to ERY, exhibited the highest prevalence among the assessed antibiotics. None of the feedlot lactobacilli harbored virulence factors genes, while positive PCR amplification for ace, agg, fsrA, and atpA genes was found for enterococci. With the objective of producing large cell biomass for probiotic delivery, growth media without peptone but containing glucose and skim milk powder (Mgl and Mlac) were selected as optimal. Lactobacillus acidophilus CRL2074, L. amylovorus CRL2115, L. mucosae CRL2069, and L. rhamnosus CRL2084 were strains selected as free of antibiotic resistance and virulence determinants, able to reach high cell numbers in non-expensive culture media and being compatible among them.Fil: Aristimuño Ficoseco, Maria Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumån. Centro de Referencia para Lactobacilos; ArgentinaFil: Mansilla, Flavia Ivana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumån. Centro de Referencia para Lactobacilos; ArgentinaFil: Maldonado, Natalia Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumån. Centro de Referencia para Lactobacilos; ArgentinaFil: Miranda, Maria Hortencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumån. Centro de Referencia para Lactobacilos; ArgentinaFil: Nader, Maria Elena Fatima. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumån. Centro de Referencia para Lactobacilos; ArgentinaFil: Vignolo, Graciela Margarita. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumån. Centro de Referencia para Lactobacilos; Argentin

    Modulation of Toll-like receptor-mediated innate immunity in bovine intestinal epithelial cells by lactic acid bacteria isolated from feedlot cattle

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    The ability of lactobacilli isolated from feedlot cattle environment to differentially modulate the innate immune response triggered by Toll-like receptors (TLRs) activation in bovine intestinal epithelial (BIE) cells was evaluated. BIE cells were stimulated with Lactobacillus mucosae CRL2069, Lactobacillus acidophilus CRL2074, Lactobacillus fermentum CRL2085 or Lactobacillus rhamnosus CRL2084 and challenged with heat-stable pathogen associated molecular patterns (PAMPs) from enterotoxigenic Escherichia coli (ETEC) to induce the activation of TLR4 or with polyinosinic:polycytidylic acid (poly(I:C)) to activate TLR3. Type I interferons, cytokines, chemokines and negative regulators of TLR signalling were studied by RT-PCR. L. mucosae CRL2069 significantly reduced the expression of interleukin (IL)-8 and monocyte chemoattractant protein (MCP)-1 in BIE cells in the context of TLR3 activation. L. mucosae CRL2069 also reduced the expression of tumour necrosis factor-α, IL-ÎČ, MCP-1, and IL-8 in heat-stable ETEC PAMPs-challenged BIE cells. In addition, reduced expressions of IL-6, MCP-1, and IL-8 were found in BIE cells stimulated with L. rhamnosus CRL2084, although its effect was significantly lower thanthat observed for the CRL2069 strain. The reduced levels of pro-inflammatory factors in BIE cells induced by the CRL2069 and CRL2085 strains was related to their ability of increasing the expression of TLR negative regulators. L. mucosae CRL2069 significantly improved the expression of A20-binding inhibitor of NFÎș-B activation 3 (ABIN3), interleukin-1 receptor-associated kinase M (IRAK-M) and mitogen-activated protein kinase 1 (MKP-1) while L. rhamnosus CRL2084 augmented ABIN-3 expression in BIE cells. The results of this work suggest that among the studied strains, L. mucosae CRL2069 was able to regulate TLR3-mediated innate immune response and showed aremarkable capacity to modulate TLR4-mediated inflammation in BIE cells. The CRL2069 strain induce the upregulation of three TLR negative regulators that would influence nuclear factor kB and mitogen-activated protein kinases signalling pathways while reducing the expression of pro-inflammatory cytokines and chemokines. Therefore, L. mucosae CRL2069 is an interesting immunobiotic candidate for the protection of the bovine host against TLRmediated intestinal inflammatory damage.Fil: Mansilla, Flavia Ivana. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Centro de Referencia para Lactobacilos; ArgentinaFil: Takagi, Michiaki. Universidad de Tohoku; JapĂłnFil: GarcĂ­a Castillo, Valeria. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Centro de Referencia para Lactobacilos; Argentina. Universidad de Tohoku; JapĂłnFil: Aso, Hisashi. Universidad de Tohoku; JapĂłnFil: Nader, Maria Elena Fatima. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Centro de Referencia para Lactobacilos; ArgentinaFil: Vignolo, Graciela Margarita. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Centro de Referencia para Lactobacilos; ArgentinaFil: Kitazawa, Haruki. Universidad de Tohoku; JapĂłnFil: Villena, Julio Cesar. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Centro de Referencia para Lactobacilos; Argentina. Universidad de Tohoku; JapĂł

    Effect of probiotic lactobacilli supplementation on growth parameters, blood profile, productive performance, and fecal microbiology in feedlot cattle

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    Lactic acid bacteria (LAB) selected on the basis of probiotic characteristics were administered to beef feedlot catlle and the effect on body condition/growth and nutritional-metabolic status as well as on E. coli O157:H7 fecal shedding, were investigated. A feeding trials involving 126 steers were used to evaluate the effects of Lactobacillus acidophilus CRL2074, Limosilactobacillus fermentum CRL2085 and Limosilactobacillus mucosae CRL2069 and their combinations (5 different probiotic groups and control) when 107-108 CFU/animal of each probiotic group were in-feed supplemented. Cattle were fed a high energy corn-based diet (16 to 88%) and samples from each animal were taken at 0, 40, 104 and 163 days. In general, animals body condition and sensorium state showed optimal muscle-skeletal development and behavioral adaption to confinement; no nasal/eye discharges and diarrheic feces were observed. The nutritional performance of the steers revealed a steady increase of biometric parameters and weight. Animals supplied with L. mucosae CRL2069 for 104 days reached the maximum mean live weight (343.2 kg), whereas the greatest weight daily gain (1.27 ± 0.16 Kg/day) was obtained when CRL2069 and its combination with L. fermentum CRL2085 (1.26 ± 0.11 kg/day) were administered during the complete fattening cycle. With several exceptions, bovine cattle blood and serum parameters showed values within referential ranges. As a preharvest strategy to reduce Escherichia coli O157:H7 in cattle feces, CRL2085 administered during 40 days decreased pathogen shedding with a reduction of 43% during the feeding period. L. fermentum CRL2085 and L. mucosae CRL2069 show promise for feedlot cattle feeding supplementation to improve metabolic-nutritional status, overall productive performance and to reduce E. coli O157:H7 shedding, thus decreasing contamination chances of meat food products.Fil: Mansilla, Flavia Ivana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumån. Centro de Referencia para Lactobacilos; ArgentinaFil: Miranda, Maria Hortencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumån. Centro de Referencia para Lactobacilos; ArgentinaFil: Uezen, Jose David. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumån. Centro de Referencia para Lactobacilos; ArgentinaFil: Maldonado, Natalia Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumån. Centro de Referencia para Lactobacilos; ArgentinaFil: D'urso Villar, Marcela Adriana. Universidad Nacional de Tucumån; ArgentinaFil: Merino, Luis Antonio. Universidad Nacional del Nordeste; ArgentinaFil: Vignolo, Graciela Margarita. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumån. Centro de Referencia para Lactobacilos; ArgentinaFil: Nader Macias, Maria Elena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumån. Centro de Referencia para Lactobacilos; Argentin

    Native Cultivable Bacteria from the Blueberry Microbiome as Novel Potential Biocontrol Agents

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    Blueberry production is affected by fungal postharvest pathogens, including Botrytis cinerea and Alternaria alternata, the causative agents of gray mold disease and Alternaria rot, respectively. Biocontrol agents adapted to blueberries and local environments are not known to date. Here, we report on the search for and the identification of cultivable blueberry epiphytic bacteria with the potential to combat the aforementioned fungi. Native, blueberry-borne bacterial strains were isolated from a plantation in Tucumán, Argentina and classified based on 16S rRNA gene sequences. Antagonistic activities directed at B. cinerea and A. alternata were studied in vitro and in vivo. The 22 bacterial strains obtained could be attributed to eleven different genera: Rosenbergiella, Fictibacillus, Bacillus, Pseudomonas, Microbacterium, Asaia, Acinetobacter, Curtobacterium, Serratia, Sphingomonas and Xylophilus. Three strains displaying antagonistic impacts on the fungal pathogens were identified as Bacillus velezensis (BA3 and BA4) and Asaia spathodeae (BMEF1). These strains are candidates for biological control agents of local blueberry production and might provide a basis for the development of eco-friendly, sustainable alternatives to synthetic pesticides

    Development of an immunobiotic evaluation system using bovine mammary epithelial cells

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    Mastitis, the inflammation of mammary glands, is one of the most costly diseases of dairy industry, which is often caused by pathogenic bacteria. Antimicrobials are applied for the treatment and prevention of bovine mastitis but their indiscriminate use arouses concerns of residual contamination and increased risk of emerging drug-resistant bacteria. Immunoregulatory probiotics (immunobiotics) are considered as potential substitute for antimicrobials for the prevention of bovine mastitis. In this work, an in vitro system for the evaluation of immunobiotics with beneficial effects against mastitis was developed by using an originally established bovine mammary epithelial cell line (BMECs). BMECs ability to respond to TLR4 activation was evaluated by stimulating cells with LPS for 12h and analyzing the global gene expression changes with a porcine microarray-based transcriptomic assay. A total of 429 genes were differently expressed after LPS stimulation and the most significant change was the up-regulation of inflammatory cytokines and chemokines (p<0.05). The enhanced expressions of IL-1ÎČ, IL-8/CXCL8, MIP2-α/CXCL2, MIP2-ÎČ/CXCL3, and MCP-1/CCL2 in BMECs after TLR4 activation were confirmed by qRT-PCR. The ability of lactobacilli isolated from feed-lot environment to modulate TLR4-mediated immune response in BMECs was also studied. BMECs were stimulated with Lactobacillus acidophilus CRL2074, L. mucosae CRL2069, L. fermentum CRL2085, or L. rhamnosus CRL2084 for 12h, 24h or 48h and then challenged with LPS for 12h. A strain dependent ability to differentially modulate inflammatory cytokines and chemokines in lactobacilli-treated BMECs was observed. The results indicate that BMECs can be used as a useful in vitro evaluation system for immunobiotics evaluation.Fil: Takagi, Michihiro. University of Tohoku; JapĂłnFil: Komatsu, Ryoya. University of Tohoku; JapĂłnFil: AlbarracĂ­n, Leonardo Miguel. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Centro de Referencia para Lactobacilos; Argentina. University of Tohoku; JapĂłnFil: Mansilla, Flavia Ivana. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Centro de Referencia para Lactobacilos; Argentina. University of Tohoku; JapĂłnFil: Islam, Md. Aminul. University of Tohoku; JapĂłnFil: Suda, Yoshihito. University of Miyagi; JapĂłnFil: Ikeda-Ohtsubo, Wakako. University of Tohoku; JapĂłnFil: Nochi, Tomonori. University of Tohoku; JapĂłnFil: Vignolo, Graciela Margarita. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Centro de Referencia para Lactobacilos; Argentina. University of Tohoku; JapĂłnFil: Aso, Hisashi. University of Tohoku; JapĂłnFil: Villena, Julio Cesar. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - TucumĂĄn. Centro de Referencia para Lactobacilos; Argentina. University of Tohoku; JapĂłnFil: Kitazawa, Haruki. University of Tohoku; JapĂłnLXVII ReuniĂłn CientĂ­fica Anual de la Sociedad Argentina de InmunologĂ­aSan Miguel de TucumĂĄnArgentinaSociedad Argentina de InmunologĂ­

    Evaluation of a quality improvement intervention to reduce anastomotic leak following right colectomy (EAGLE): pragmatic, batched stepped-wedge, cluster-randomized trial in 64 countries

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    Background Anastomotic leak affects 8 per cent of patients after right colectomy with a 10-fold increased risk of postoperative death. The EAGLE study aimed to develop and test whether an international, standardized quality improvement intervention could reduce anastomotic leaks. Methods The internationally intended protocol, iteratively co-developed by a multistage Delphi process, comprised an online educational module introducing risk stratification, an intraoperative checklist, and harmonized surgical techniques. Clusters (hospital teams) were randomized to one of three arms with varied sequences of intervention/data collection by a derived stepped-wedge batch design (at least 18 hospital teams per batch). Patients were blinded to the study allocation. Low- and middle-income country enrolment was encouraged. The primary outcome (assessed by intention to treat) was anastomotic leak rate, and subgroup analyses by module completion (at least 80 per cent of surgeons, high engagement; less than 50 per cent, low engagement) were preplanned. Results A total 355 hospital teams registered, with 332 from 64 countries (39.2 per cent low and middle income) included in the final analysis. The online modules were completed by half of the surgeons (2143 of 4411). The primary analysis included 3039 of the 3268 patients recruited (206 patients had no anastomosis and 23 were lost to follow-up), with anastomotic leaks arising before and after the intervention in 10.1 and 9.6 per cent respectively (adjusted OR 0.87, 95 per cent c.i. 0.59 to 1.30; P = 0.498). The proportion of surgeons completing the educational modules was an influence: the leak rate decreased from 12.2 per cent (61 of 500) before intervention to 5.1 per cent (24 of 473) after intervention in high-engagement centres (adjusted OR 0.36, 0.20 to 0.64; P &lt; 0.001), but this was not observed in low-engagement hospitals (8.3 per cent (59 of 714) and 13.8 per cent (61 of 443) respectively; adjusted OR 2.09, 1.31 to 3.31). Conclusion Completion of globally available digital training by engaged teams can alter anastomotic leak rates. Registration number: NCT04270721 (http://www.clinicaltrials.gov)
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