View clinical trials related to Disease Susceptibility.
Filter by:The role of the nasopharyngeal mucosal microbiota has recently been emphasized in respiratory diseases. The hypothesis that respiratory infections are linked to an imbalance of the nasopharyngeal microbiota has recently emerged and some studies show a link between the respiratory microbiota, the susceptibility to viral respiratory infections and the severity induced. In a preliminary work on the respiratory microbiota from 225 patients and 48 controls, the investigators found a decrease in the richness and biodiversity of the nasopharyngeal microbiota in patients with a respiratory viral infection as well as an enrichment of their respiratory flora in pathogenic bacteria. Interestingly, these recent years, the development of qPCR for virus diagnosis showed a substantial proportion of asymptomatic carriers of viruses suggesting that the nasopharyngeal microbiota may play a critical role in the genesis and clinical expression of viral respiratory infection, challenging Koch's postulate. The principal objectives of this study are to compare the respiratory microbiota between symptomatic patients with respiratory viral infection and asymptomatic carrier of virus. The aim is to determine the existence of respiratory microbiota profiles associated with the occurrence of viral respiratory infections influencing the clinical expression of virus and to determine the role of the respiratory microbiota in the occurrence of bacterial superinfection which will justify an early antibiotic treatment. The investigators will include 35 symptomatic patients with viral respiratory infection harboring positive qPCR for respiratory virus (influenza A or B, RSV, rhinovirus, metapneumovirus), 35 asymptomatic patients with positive qPCR for respiratory virus and 30 healthy subjects (controls). A pharyngeal and a nasal swabs will be performed for each patient. All the samples will be analyse by culturomics and metagenomic. Culturomic is a high-throughput culture strategy based on the multiplication of culture conditions coupled with the rapid identification of bacteria by MALDI-TOF (Matrix-Assisted Laser Desorption / Ionization-Time-Of-Flight) mass spectrometry.Metagenomics is an high throughput sequencing and will be performed using Miseq ( Illumina technology) targeting the V3-V4 hypervariable regions of the 16S RNA gene.
Performing a phenome-wide association study (PheWAS) identifying clinical diagnoses associated with a polygenic predictor of Thyroid stimulating hormone (TSH) levels identified by a previously published genome-wide association study (GWAS). PheWAS will be applied in an electronic-health-record (EHR) cohort including North American (n: 37,154) and European participants using 1,318 phenotypes.
The purpose of this study is to assess efficacy of 10-day antimicrobial susceptibility test guided triple therapy for the first-line treatment of Helicobacter pylori infection, then comparing it with 14-day empirical tailored therapy to tell which one has a better performance in both efficacy and safety.
The purpose of this study is to assess efficacy of 14-day antimicrobial susceptibility test guided quadruple therapy for the rescue treatment of Helicobacter pylori infection, then comparing it with 14-day personal medication history guided therapy to tell which one has a better performance in both efficacy and safety.
Atrial fibrillation (AF) is the most frequently encountered cardiac arrhythmia. Emerging data suggests that common genetic variants are associated with the development of AF. The main feature of the structural remodelling in AF is atrial fibrosis and is considered the substrate for AF perpetuation. Genome-wide association studies suggest that AF-susceptibility variants may modulate atrial fibrosis. However, the association between atrial fibrosis and genetic polymorphisms in humans has not yet been specifically investigated. In this study, we plan to investigate the relationship between genetic polymorphisms, atrial fibrosis and other components of thrombogenic substrate in patients with non-valvular AF. Primary objectives of this study are to assess associations between (i) polymorphic genetic variants and atrial fibrosis (detected by magnetic resonance imaging), (ii) polymorphic genetic variants and components of thrombogenic substrate (inflammation, endothelial function, prothrombotic state, atrial functions).
We aimed to (1) compare the efficacy of genotypic resistance guided sequential therapy vs. susceptibility testing guided therapy in the first-line therapy (2) assess the long term impact of eradication therapy on the antibiotic resistance and microbiota of the gut flora and the metabolic factors in this multi-center, open labeled trial
Controlled human malaria infection (CHMI) is an important tool for the assessment of the efficacy of novel malaria vaccines and drugs prior to field trials. CHMI also allows for the evaluation of immunity to malaria and parasite growth rates in vivo and thus allows for the assessment of the natural acquisition and loss of malaria immunity. This may be particularly useful in individuals from endemic areas with changing levels of exposure and immunity to malaria. Thus, CHMI in individuals with prior exposure to malaria could be a valuable tool to accelerate malaria vaccine development and inform malaria control programs of changing immunity levels and related disease presentations. In this trial, the investigators intend to study the effect of pre-exposure to Plasmodium falciparum (Pf) on parasite kinetics, clinical symptoms and immunity after CHMI by PfSPZ Challenge in Gambian adults. Based on a well-defined sero-profile representing the extremes of current malaria exposure in The Gambia, two cohorts will be identified to study the impact of naturally acquired immunity on susceptibility for a Controlled Human Malaria Infection.
The DiRiP study will enroll patients (n = 3500) with unclear rare diseases and suspected genetic reasons. In group 1 (n = 500) subjects are clinically characterized in the context of outpatient/ inpatient standard care at the UKT or cooperating location, NGS analyzes and other omics analyzes (transcriptomics, proteomics, metabolomics), functional cell biology studies will be performed. In group 2 diagnostics is already performed. The DiRiP-study fully integrates with the newly formed European Reference Networks (ERNs) for rare diseases, and in particular the ERN-RND, -EURO-NMD, -ITHACA, and -GENTURIS.
Evidence suggests that repeated or chronic ketamine use, as compared to acute ketamine users, posed a higher clinical risk of developing psychotic disorders, potentially related to the underlying chronic N-methyl-D-aspartate receptor (NMDAR) dysfunction, and a higher risk of suffering from schizophrenia particularly in those genetically susceptible, or genetically predisposed ketamine abusers. With ketamine infusion rises as a emerging hope as an acute treatment for depression and suicidality under the shadow of unknown longer term psychotomimetic effects peculiarly amongst repeated or chronic use, the current case-control study aims to investigate: a) if repeated or chronic ketamine use is associated with an increased risk of psychosis by comparing those ketamine abusers with and without psychosis, and to those non-ketamine-using drug abusers with psychosis; and b) if genetic predisposition from single nucleotide polymorphisms are associated with risk of psychosis in ketamine abusers.
This pilot study will assess the impact of four antimicrobial products (3 topical, one systemic) on the foreskin microbiome and HIV susceptibility of foreskin-derived CD4+ T cells. Participants will include HIV-uninfected Ugandan men presenting for elective male circumcision to reduce their HIV risk.