Quorum sensing regulates virulence factors in the coral pathogen .

The bacterial pathogen causes disease in coral species worldwide. The mechanisms of coral colonization, coral microbiome interactions, and virulence factor production are understudied. In other model species, virulence factors like biofilm formation, toxin secretion, and protease production are controlled through a density-dependent communication system called quorum sensing (QS).

Risk factors and outcome of Pseudomonas aeruginosa bloodstream infections (PABSI) in hematological patients: a single center retrospective cohort study.

Purpose: Bloodstream infections caused by Pseudomonas aeruginosa (PABSI) in hematological patients are associated with high morbidity and mortality. We investigated the epidemiology, risk factors, and outcomes of PABSI at our center.

Methods: All adult hematological patients with PABSI between January 2013 and July 2023 were included.

[Summary of the S1 guideline on sustainability in intensive care and emergency medicine].

Background: Man-made climate change is one of the greatest challenges of the future. The course is being set in the current generation. As the healthcare sector contributes a considerable proportion of greenhouse gas emissions, measures to counteract this must be introduced as a matter of urgency.

Quorum sensing in Vibrio controls carbon metabolism to optimize growth in changing environmental conditions.

Bacteria sense population density via the cell-cell communication system called quorum sensing (QS). The evolution of QS and its maintenance or loss in mixed bacterial communities is highly relevant to understanding how cell-cell signaling impacts bacterial fitness and competition, particularly under varying environmental conditions such as nutrient availability. We uncovered a phenomenon in which Vibrio cells grown in minimal medium optimize expression of the methionine and tetrahydrofolate (THF) synthesis genes via QS.

Direct Comparison of Quality of Life in Patients with Allergic Rhinitis Undergoing Sublingual Versus Subcutaneous Immunotherapy.

: Subcutaneous immunotherapy (SCIT) and sublingual immunotherapy (SLIT) are commonly used for allergic rhinitis (AR), yet limited research has directly compared their effects on quality of life (QoL). We aimed to assess QoL differences between SLIT and SCIT recipients. As both forms of immunotherapy have reported benefits, we hypothesize that patients undergoing SLIT and SCIT will have comparable QoL improvements.

: a fundamental model system for bacterial genetics and pathogenesis research.

Species of the genus occupy diverse aquatic environments ranging from brackish water to warm equatorial seas to salty coastal regions. More than 80 species of have been identified, many of them as pathogens of marine organisms, including fish, shellfish, and corals, causing disease and wreaking havoc on aquacultures and coral reefs. Moreover, many species associate with and thrive on chitinous organisms abundant in the ocean.

Quorum sensing employs a dual regulatory mechanism to repress T3SS gene expression.

Unlabelled: The type III secretion system (T3SS) is a needle-like complex used by numerous bacterial pathogens in host infection by directly injecting exotoxins into the host cell cytoplasm, leading to cell death. The T3SS is a known virulence factor in the shrimp pathogen . The ∼40 genes comprising the T3SS are regulated by a network of transcription factors in response to changes in the cell's environment: cell density (quorum sensing; QS), temperature, calcium, and host cell contact.

Porcine γδ T cells express cytotoxic cell-associated markers and display killing activity but are not selectively cytotoxic against PRRSV- or swIAV-infected macrophages.

Background: Gamma-delta (γδ) T cells are a major immune cell subset in pigs. Approximately 50% of circulating T cells are γδ T cells in young pigs and up to 30% in adult sows. Despite this abundance, the functions of porcine γδ T cells are mostly unidentified.

Intraoperative Polymerase Chain Reaction from Cardiac Valve Tissue Is Beneficial for Guiding Further Therapy in Patients with Infective Endocarditis.

: Infectious endocarditis (IE) remains a critical condition despite all the medical advances in recent decades. Reliable pathogen identification is indispensable for precise therapy. The aim of this study was to evaluate the diagnostic and therapeutic benefit of additional polymerase chain reaction (PCR) in comparison with microbiological culture alone based on intraoperative tissue sampling for patients operated on due to IE.

Mobile-CRISPRi protocol optimization for .

Mobile clustered regularly interspaced palindromic repeats interference (Mobile-CRISPRi) is an established method for bacterial gene expression knockdown. The deactivated Cas9 protein and guide RNA are isopropyl β-D-1-thiogalactopyranoside inducible, and all components are integrated into the chromosome via Tn transposition. Here, we optimized methods specific for applying Mobile-CRISPRi in multiple species.

Synthesis and Assay of Vibrio Quorum Sensing Inhibitors.

Bacteria detect local population numbers using quorum sensing, a method of cell-cell communication broadly utilized to control bacterial behaviors. In Vibrio species, the master quorum sensing regulators LuxR/HapR control hundreds of quorum sensing genes, many of which influence virulence, metabolism, motility, and more. Thiophenesulfonamides are potent inhibitors of LuxR/HapR that bind the ligand pocket in these transcription factors and block downstream quorum sensing gene expression.

Mobile-CRISPRi as a powerful tool for modulating gene expression.

CRISPRi (Clustered Regularly Interspaced Palindromic Repeats interference) is a gene knockdown method that uses a deactivated Cas9 protein (dCas9) that binds a specific gene target locus dictated by an encoded guide RNA (sgRNA) to block transcription. Mobile-CRISPRi is a suite of modular vectors that enable CRISPRi knockdowns in diverse bacteria by integrating IPTG-inducible and genes into the genome using Tn transposition. Here, we show that the Mobile-CRISPRi system functions robustly and specifically in multiple species: , , , , and .

Efficacy of a stable broadly protective subunit vaccine platform against SARS-CoV-2 variants of concern.

The emergence and ongoing evolution of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has highlighted the need for rapid vaccine development platforms that can be updated to counteract emerging variants of currently circulating and future emerging coronaviruses. Here we report the development of a "train model" subunit vaccine platform that contains a SARS-CoV-2 Wuhan S1 protein (the "engine") linked to a series of flexible receptor binding domains (RBDs; the "cars") derived from SARS-CoV-2 variants of concern (VOCs). We demonstrate that these linked subunit vaccines when combined with Sepivac SWE™, a squalene in water emulsion (SWE) adjuvant, are immunogenic in Syrian hamsters and subsequently provide protection from infection with SARS-CoV-2 VOCs Omicron (BA.

Inactivation of , , and using the Contamination Sanitization Inspection and Disinfection (CSI-D) device.

The Contamination Sanitization Inspection and Disinfection (CSI-D) device is a handheld fluorescence-based imaging system designed to disinfect food contact surfaces using ultraviolet-C (UVC) illumination. This study aimed to determine the optimal CSI-D parameters (i.e.

Isolated from Bovine Sources Encoding the Fosfomycin Resistance Gene .5.

Dairy animals are reservoirs of antimicrobial-resistant that are frequently resistant to tetracycline, aminoglycoside, β-lactam, sulfonamide, and macrolide-lincosamide-streptogramin B antibiotics. However, resistance to other classes of antimicrobials is less frequently observed, and resistance to fosfomycin is rarely observed in . In this study, we describe the genomic characteristics of encoding that have been recovered from bovine sources in the United States.

Quality, availability and suitability of antimicrobial stewardship guidance: a multinational qualitative study.

Background: Antimicrobial stewardship (AMS) programmes are established across the world to treat infections efficiently, prioritize patient safety, and reduce the emergence of antimicrobial resistance. One of the core elements of AMS programmes is guidance to support and direct physicians in making efficient, safe and optimal decisions when prescribing antibiotics. To optimize and tailor AMS, we need a better understanding of prescribing physicians' experience with AMS guidance.

Ovaries of estrogen receptor 1-deficient mice show iron overload and signs of aging.

Introduction: Estrogens are crucial regulators of ovarian function, mediating their signaling through binding to estrogen receptors. The disruption of the estrogen receptor 1 () provokes infertility associated with a hemorrhagic, cystic phenotype similar to that seen in diseased or aged ovaries. Our previous study indicated the possibility of altered iron metabolism in -deficient ovaries showing massive expression of lipocalin 2, a regulator of iron homeostasis.

Ligand binding determines proteolytic stability of LuxR/HapR quorum sensing transcription factors.

Unlabelled: In species, quorum sensing signaling culminates in the production of a TetR-type master transcription factor collectively called the LuxR/HapR family, which regulates genes required for colonization and infection of host organisms. These proteins possess a solvent accessible putative ligand binding pocket. However, a native ligand has not been identified, and the role of ligand binding in LuxR/HapR function in is unknown.

From the Oral Cavity to the Spine: Prevalence of Oral Cavity Infections in Patients with Pyogenic Spinal Infection.

Background incidence of pyogenic spinal infections has increased in recent years. In addition to treating the spinal infection, optimal care also includes identifying the source of the pyogenic spinal infection and the presence of other infections. The aim of this study is to elucidate the prevalence of oral cavity infection (OCI) within this patient cohort.

Survival after cryptococcosis in Germany: A retrospective multicenter cohort study of patients diagnosed between 2004 and 2021.

Cryptococcosis is the most prevalent fungal infection of the central nervous system worldwide. We performed a retrospective multicenter cohort study to gain insights into the epidemiology of cryptococcosis in Germany. We describe the use of diagnostic tests, clinical management and patient outcome.

Bacterial quorum sensing controls carbon metabolism to optimize growth in changing environmental conditions.

Bacteria sense population density via the cell-cell communication system called quorum sensing (QS). Some QS-regulated phenotypes ( , secreted enzymes, chelators), are public goods exploitable by cells that stop producing them. We uncovered a phenomenon in which cells optimize expression of the methionine and tetrahydrofolate (THF) synthesis genes via QS.