View clinical trials related to Microbial Colonization.
Filter by:Periodontitis is an inflammatory disease characterized by a dysbiotic microbiome which can lead to bone destruction and tooth loss. Several studies had been reported the association to periodontal disease with systemic conditions and this relation suggests and axis that links oral and gut microbiome. In order to clarify the impact of periodontal condition on gut microbiome, we aim to evaluate the clinical, immunological parameters and the microbiological condition by sequencing of subgingival biofilm and stool samples both before and after non-surgical periodontal treatment with and without antibiotics as adjunct.
Background: Intestinal microbiota composition is fundamental to human health and undergoes critical changes within the first two years of life. Factors probably influencing the microbiota are the maternal microbiota and the general environment in Switzerland. However, the development of the intestinal microbiota is incompletely understood. Gaining knowledge of the trajectory of microbiota maturation is likely key to the understanding of the pathogenesis of many pathologies in childhood. Aims: The investigators aim for a deep understanding of the maturation of the healthy infant intestinal microbiota regarding composition, diversity and metabolic activities. The investigators aim for identifying parameters affecting microbiota maturation and effects of the microbiota on infant outcome. Methods: The investigators will recruit 250 pregnant mothers who will be followed as mother-baby pairs until 10 years of age. Infants will be followed clinically to determine adequate growth and development as well as pathology including abdominal pain. Epidemiological parameter and infant nutrition will be assessed. The investigators will collect biological samples such as stool, maternal milk, vaginal swaps and skin swaps. Species composition and diversity will be assessed by 16S sequencing. Metagenomic shotgun sequencing and bacterial messenger ribonucleic acid (mRNA) analysis will inform about metabolic potential and metabolic activity of the microbiota. Mass spectrometry will assess the small molecule content of stool and maternal milk samples. Network analysis will be used to assess the complex relationships between bacteria metabolic activities and small molecular content. Expected results: The investigators expect an increase in complexity and metabolic potential and activity with age. Microbiota parameters will differ according to nutrition and might predict infant outcomes such as growth and abdominal pain. Systematic analysis of sequential maternal and infant bacteria samples from stool, skin and maternal milk will help characterizing bacterial transfer from mother to infant Conclusion: The investigators propose an observational study of healthy Bern mother baby pairs with clinical characterisation and biological sampling. Advanced analysis tools will be used to characterise the microbiota and address mechanistic questions.
This is a prospective study on the microbiota associated with oesophageal squamous cell carcinoma (SCC). Patients with newly diagnosed SCC of oesophagus would be recruited for taking samples of oral and oesophageal rinse, tissue biopsies for investigation of the microbiota of oesophageal cancer. Control patients would be identified from patients scheduled for routine endoscopy.
Microbiome in patients affected by pancreatic ductal adenocarcinoma may present specific and identifiable patterns. These variations could affect the surgical outcome and increase the risk of life-threatening infections supported by multidrug-resistant bacteria. The identification of microbial signatures with tumor specificity may have a potential role in postoperative risk stratification. Variation of pancreatic, intestinal or bile microbiome and their relationship can be investigated and measured as promising tools in order to predict and overcome the clinical and infectious burden imposed by MDR infections. The prospect of a potential role for probiotics to promote competition against the pathogens and to improve the gastrointestinal barrier integrity has also been raised. Moreover, if the bacterial composition in human PDAC was confirmed to be distinct from that of the normal pancreas, microbiome variation could be used as a potential biomarker, to assess the potential for malignancy in precursor neoplastic lesions. However, we believe that a preliminary and explorative study is necessary. The study aims to outline the pancreatic microbiome of patients who undergo upfront PD for resectable PDAC and to characterize the possible association between bacterial composition and the occurrence of post-operative complications, particularly POPF and IC.
Microbiota contributes to the immunological, hormonal and metabolic homeostasis of the host. As in all natural orifices in the body, there is also a microbiota and mycobiota specific to the vagina. On the other hand, the sonographic short cervix in the second trimester of pregnancy is associated with preterm delivery, which may be an important cause of mortality and morbidity in the neonatal period. American Society of Obstetricians and Gynecologists (ACOG), British Royal Society of Obstetricians and Gynecologists (RCOG) and the American Society of Maternal Fetal Medicine (SMFM) suggest that the measurement of transvaginal sonographic cervical length at 20-24 gestational weeks for the screening of preterm birth. The aforementioned associations also recommend the use of progesterone in the treatment of women who diagnosed with short cervix by transvaginal ultrasonography due to the fact that progesterone is an effective medication in the prevention of preterm birth (Grade B). Previous vaginal microbiota studies have shown that some bacterial species such as Lactobacillus insers cause a predisposition to premature labor in women with a short cervix. However, the prominent lack in these studies is that the eukaryotic fungi in abundant vaginal flora have not been evaluated. On the other hand, it was already shown that progesterone treatment is able to prevent only 45% preterm birth in women with short cervical length. This observational prospective study thus aims to evaluate the variety of microbiota and/or mycobiota in pregnancies resulting in preterm birth and those who give birth at term. Although women with short cervical length receive progesterone regularly from the second trimester, the preterm birth may occur. In this study, the investigators also aim to evaluate the patterns of microbiota and mycobiota from vaginal swabs of women who had preterm birth with short cervical length and postpartum swabs of the placenta and fetal oral cavity.
This study aims to investigate the changes in the microbiota at different body sites in late pregnancy, in comparison with non-pregnant women, with particular emphasis on archaea, and to identify possible maternal-to-child transfer routes for acquisition of strictly anaerobic microorganisms by analyzing the gut microbiota of new born infants (delivered vaginally or by C-section).
Antimicrobial resistance is a major threat worldwide and extended-spectrum beta-lactamase producing Enterobacteriales (ESBL-E) are a leading cause because of their wide dissemination. Gut microbiota seems to be correlated with multi-drug resistant organism carriage. This study thus aims to analyse the correlation between gut microbiota, ESBL-E fecal carriage and subsequent infection.
This study will evaluate the impact of matching donor human milk to the maternal secretor status of very preterm infants (<34 weeks gestation) on the gut microbiome. Half of enrolled infants will receive donor human milk which is matched their mother's secretor status and half will receive standard (unmatched) donor human milk, which is standard care in the neonatal intensive care unit.
Children enrolled in the study will receive either the prebiotic inulin or a placebo for 21 days during the study period. They will start taking the product seven days before transplant starts until 14 days after transplant. Stool will be collected twice weekly until thirty days after transplant or discharge, whichever occurs first. Stool samples will be sampled for metagenomic sequencing to identify the diversity of bacteria within the stool. They will also be analyzed for amount of short-chain fatty acid content (a breakdown product of inulin) as well as for presence of genes that confer antibiotic resistance. From 30 days after transplant until 100 days after transplant, two stool samples will be collected at regularly scheduled follow up appointments (near day 60 and day 100). No product (inulin or placebo) will be given during this time frame. The study period ends 100 days after transplant.
This study aims to evaluate the modifications in body composition and insulin resistance state in patients with grade II and III obesity included in an interventional lifestyle changes program and treated with probiotics (1 x 1011 CFU) or placebo for 16 weeks and its associations with intestinal microbiota behaviour