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The Role Of The Msaabcr Operon In Cell Wall Integrity And Programmed Cell Death During Biofilm Development, Bibek G C

Dissertations

Staphylococcus aureus is an important human pathogen in both community and health care settings. Biggest challenges with S. aureus as a pathogen is its ability to acquire antibiotic resistance and produce robust biofilms. In this work, we investigated the nature of the cell wall defect in the msaABCR operon mutant in the Mu50 (VISA) and USA300 LAC methicillin-resistant Staphylococcus aureus (MRSA) strains. Results showed that msaABCR-mutant cells had decreased cell wall thickness and cell wall crosslinking in both strains. These defects are most likely due to increased murein hydrolase activity and/or nonspecific processing of murein hydrolases mediated by increased …

F Plasmids In Escherichia Coli Decrease Permissivity To Coliphage, Cesar Eber Montelongo Hernandez

Dissertations

The urinary tract contains a community of bacteria called the urinary microbiota (urobiota) thatmay be relevant to health; the genomic component of the urobiota is the urinary microbiome (urobiome). Urinary bacteria have been associated with both asymptomatic states and disease conditions, such as urinary tract infection (UTI), overactive bladder (OAB), and urge urinary incontinence (UUI). Some bacteria, such as E. coli, are considered urinary pathogens (uropathogens) but also can be commensals. Bacteriophage (phage) are ubiquitous in nature and likely shape bacterial populations in every niche; thus, phage may be one factor that modulates the urobiota. Phages have a specific host …

Sustainability Of An Outpatient Antibiotic Stewardship Program, Kristin Smith

Dissertations

Abstract

Problem: Antibiotic stewardship is an effort to evaluate and improve the use of antibiotics by providers and patients. Antibiotic stewardship programs (ASPs) promote the appropriate use of antibiotics. There is increasing evidence that supports the use of antibiotic stewardship programs in reducing antibiotic prescribing rates while continuing to maintain safe patient care. Research supports approaches with multiple interventions and ongoing commitment to antibiotic stewardship. However, information regarding long-term sustainability of antibiotic stewardship programs is lacking. The purpose of this quality assurance project was to assess long-term sustainability of a previously implemented ASP promoting appropriate prescribing of antibiotics for the …

Antibiotic Resistant Bacteria, Antibiotic Resistance Genes And Potential Drivers In The Aquatic Environments, Shuo Shen

Dissertations

As antibiotic resistance genes in aquatic environment have been increasing across the world, affecting water quality and public health, many studies documented concentrations of antibiotic resistance genes and some studies discussed their potential drivers. However, systematic and quantitative reviews that link antibiotic resistance genes (ARGs) to anthropogenic and environmental factors are limited. Nevertheless, this information will be important for developing regulation policy on controlling antibiotic use and therefore reducing potential risks to antibiotic resistance. I conducted meta-analysis of ARGs concentration at a global scale using Bayesian inference to explore climatic and socio-economic factors as drivers. I found local-scale climatic variables …

Implementing The Cdcs Core Elements Of Outpatient Antibiotic Stewardship Program Into The Urgent Care, Deanna Powelson

Dissertations

Purpose: The inappropriate use of antibiotics has led to the development of antimicrobial

resistance which is a severe threat to the public and an increasing global problem. The

Centers for Disease Control and Prevention (CDC) estimates at least two million illnesses

and 23,000 deaths are caused by antibiotic-resistant bacteria in the United States (CDC,

2014). The purpose of this quality improvement (QI) project was to evaluate the

effectiveness of an antibiotic stewardship program (ASP) on urgent care providers'

prescribing on viral respiratory tract infections (RTIs) including the common cold,

pharyngitis, and bronchitis.

Methods: This QI project implemented the CDCs Core …

Prophylactic Antibiotic Use In Female Patients With Pelvic Floor Reconstructive Surgery: A Retrospective Comparative Effectiveness Study, Courtney E. Turnbough

Dissertations

Problem: The purpose of this project was to determine the most effective prophylactic antibiotic to decrease the number of patients who have urinary tract infections (UTIs) after pelvic floor reconstructive surgery in a gynecological reconstructive surgery practice.

Methods: This was a retrospective chart review from 2015-2017 that included 732 subjects from a single practice. All patients underwent pelvic floor reconstructive surgery, with or without a midurethral sling placed. Patients also had a catheter and vaginal packing postoperatively. Patients who had a culture-proven UTI within the six-week postoperative period were noted.

Results: There were less UTIs (χ2 = 12.119, df = …

Synthetic Ion Channels: A New Class Of Membrane Disruptor And Efflux Pump Inhibitor For The Recovery Of Antibiotic Potency, Mohit Bharatkumar Patel

Dissertations

Antibiotic resistance has become a world-wide health care crisis. In 2013 there were 50,000 deaths in U.S. and EU, associated with hospital acquired bacterial infections. This problem is exacerbated by the lack of new antibiotics in development. Here, we report that synthetic amphiphiles represent a new class of adjuvants that rescue antibiotic potency against multidrug resistant bacteria. Hydraphiles are amphiphiles, designed and synthesized in Gokel lab, that show many of the same properties as protein ion channels. Hydraphiles were previously shown to have antimicrobial activity against Escherichia coli, Bacillus subtilis and Saccharomyces cerevisiae. Here, we report that hydraphiles recover the …

Regulation Of Biofilm And Antibiotic-Resistance By The Modulator Of Sara (Msa) In Staphylococcus Aureus, Antony Schwartz

Dissertations

Staphylococcus aureus is an important human pathogen that is the causative agent of life-threatening diseases such as endocarditis and osteomyelitis. The ability of S. aureus to thrive as a successful pathogen can be partially attributed to its ability to form biofilm. Biofilm is an extracellular polysaccharide, protein, and DNA-based slime layer that protects the bacterial community. The global regulator sarA is essential for biofilm formation. Since the modulator of sarA (msa) gene regulates several virulence factors and is required for the full expression of sarA, the capacity of the msa mutant to form a biofilm was examined. The mutation of …