Characterizing The Role Of Cpsa In Mycobacterial Pathogenesis, 2017 Washington University in St. Louis
Characterizing The Role Of Cpsa In Mycobacterial Pathogenesis, Amir Hassan
Undergraduate Research Symposium Posters
Mycobacterium tuberculosis infects one-third of the world’s population and causes an estimated 2 million deaths per year, more than any other single bacterial pathogen. The inadequacies of existing tuberculosis therapies demand the discovery of novel agents to treat M. tuberculosis infection, which requires mechanistic insight into the pathways involved in mycobacterial pathogenesis. We identified an unanticipated role of the M. tuberculosis protein CpsA in preventing phago-lysosome fusion by host macrophages, resulting in enhanced intracellular survival of bacteria within the host. Strains of M. tuberculosis lacking cpsA are severely attenuated in both macrophage and mouse models, thus establishing CpsA as ...
Biomarkers Of Sepsis: A Retrospective Approach, 2017 The University of Akron
Biomarkers Of Sepsis: A Retrospective Approach, Jose M. Roberts
Williams Honors College, Honors Research Projects
Background: Biomarkers are taking the spotlight in becoming the norm for early diagnoses. Sepsis is an inflammatory disease that increases metabolic rate in children. The first biomarker is hyponatremia. Hyponatremia is a frequent electrolyte imbalance in clinical practice, often observed in children with inflammatory disease and infection. Presence of hyponatremia is associated with electrical signaling imbalances, inflammation and renal dysfunction. The clinical value of hyponatremia in pediatric patients is unknown. The C-reactive protein is a second biomarker. Its presence signifies that necrotic cells and inflammation are present.
Objectives: To evaluate the use of biomarkers in children seen in the Emergency ...
Epidemiological Investigation Of Candida Species Causing Bloodstream Infection In Pediatric Small Bowel Transplant Recipients, 2017 University of Nebraska-Lincoln
Epidemiological Investigation Of Candida Species Causing Bloodstream Infection In Pediatric Small Bowel Transplant Recipients, Mallory J. Suhr, João Carlos Gomes-Neto, Nabaraj Banjara, Diana F. Florescu, David F. Mercer, Peter C. Iwen, Heather E. Hallen-Adams
Faculty Publications in Food Science and Technology
Small bowel transplantation (SBT) can be a life-saving medical procedure. However, these recipients experience high risk of bloodstream infections caused by Candida. This research aims to characterize the SBT recipient gut microbiota over time following transplantation and investigate the epidemiology of candidemia in seven pediatric patients. Candida species from the recipients’ ileum and bloodstream were identified by internal transcribed spacer sequence and distinguished to strain by multilocus sequence typing and randomly amplified polymorphic DNA. Antifungal susceptibility of bloodstream isolates was determined against nine antifungals. Twenty-two ileostomy samples harbored at least one Candida species. Fungemia were caused by Candida parapsilosis, Candida ...
Mucosal Fluid Glycoprotein Dmbt1 Suppresses Twitching Motility And Virulence Of The Opportunistic Pathogen Pseudomonas Aeruginosa, 2017 Touro University California
Mucosal Fluid Glycoprotein Dmbt1 Suppresses Twitching Motility And Virulence Of The Opportunistic Pathogen Pseudomonas Aeruginosa, Jianfang Li, Matteo E. O. Metruccio, David J. Evans, Suzanne M. J. Fleiszig
College of Pharmacy (TUC) Publications and Research
It is generally thought that mucosal fluids protect underlying epithelial surfaces against opportunistic infection via their antimicrobial activity. However, our published data show that human tear fluid can protect against the major opportunistic pathogen Pseudomonas aeruginosa independently of bacteriostatic activity. Here, we explored the mechanisms for tear protection, focusing on impacts of tear fluid on bacterial virulence factor expression. Results showed that tear fluid suppressed twitching motility, a type of surface-associated movement conferred by pili. Previously, we showed that twitching is critical for P. aeruginosa traversal of corneal epithelia, exit from epithelial cells after internalization, and corneal virulence. Inhibition of ...
Performance Of The G4 Xpert(R) Mtb/Rif Assay For The Detection Of Mycobacterium Tuberculosis And Rifampin Resistance: A Retrospective Case-Control Study Of Analytical And Clinical Samples From High- And Low-Tuberculosis Prevalence Settings, 2016 The State University of New Jersey
Performance Of The G4 Xpert(R) Mtb/Rif Assay For The Detection Of Mycobacterium Tuberculosis And Rifampin Resistance: A Retrospective Case-Control Study Of Analytical And Clinical Samples From High- And Low-Tuberculosis Prevalence Settings, Nila J. Dharan, Robert Blakemore, Alexander Sloutsky, Devinder Kaur, Richard C. Alexander, Minoo Ghajar, Kimberlee A. Musser, Vincent E. Escuyer, Marie-Claire Rowlinson, Susanne Crowe, Rafael Laniado-Laborin, Eloise Valli, Pamela Nabeta, Pamela Johnson, David Alland
Open Access Articles
BACKGROUND: The Xpert(R) MTB/RIF (Xpert) assay is a rapid PCR-based assay for the detection of Mycobacterium tuberculosis complex DNA (MTBc) and mutations associated with rifampin resistance (RIF). An updated version introduced in 2011, the G4 Xpert, included modifications to probe B and updated analytic software.
METHODS: An analytical study was performed to assess Xpert detection of mutations associated with rifampin resistance in rifampin-susceptible and -resistant isolates. A clinical study was performed in which specimens from US and non-US persons suspected of tuberculosis (TB) were tested to determine Xpert performance characteristics. All specimens underwent smear microscopy, mycobacterial culture, conventional ...
Geographical Incidence Of Antimicrobial Resistant Gonorrhea, 2016 University of San Francisco
Geographical Incidence Of Antimicrobial Resistant Gonorrhea, Christofer A. Rodriguez
Master's Projects and Capstones
Evolving throughout the last century, Gonorrhea has become a superbug, becoming difficult to treat. As the second most commonly reported notifiable disease, gonorrhea rates have been increasing, despite efforts in prevention and treatment. Populations at risk are mainly MSM and FSW. In 2015, men’s gonorrhea rates in the United States were higher compared to women, at 140.9 and 107.2 per 100,000 population, respectively. Illinois has consecutively had higher rates of infection compared to the US, at 133.5 per 100,000 population compared to the US rate of 123.9 per 100,000 population. The surveillance ...
Xpert Mtb/Rif Assay Shows Faster Clearance Of Mycobacterium Tuberculosis Dna With Higher Levels Of Rifapentine Exposure., 2016 George Washington University
Xpert Mtb/Rif Assay Shows Faster Clearance Of Mycobacterium Tuberculosis Dna With Higher Levels Of Rifapentine Exposure., A Jayakumar, R M Savic, C K Everett, Debra Benator, D Alland, C M Heilig, M Weiner, S O Friedrich, N A Martinson, A Kerrigan, C Zamudio, S V Goldberg, W C Whitworth, J L Davis, P Nahid
Medicine Faculty Publications
The Xpert MTB/RIF assay is both sensitive and specific as a diagnostic test. Xpert also reports quantitative output in cycle threshold (CT) values, which may provide a dynamic measure of sputum bacillary burden when used longitudinally. We evaluated the relationship between Xpert CT trajectory and drug exposure during tuberculosis (TB) treatment to assess the potential utility of Xpert CT for treatment monitoring. We obtained serial sputum samples from patients with smear-positive pulmonary TB who were consecutively enrolled at 10 international clinical trial sites participating in study 29X, a CDC-sponsored Tuberculosis Trials Consortium study evaluating the tolerability, safety, and antimicrobial ...
Pertussis-Associated Pneumonia In Infants And Children From Low- And Middle-Income Countries Participating In The Perch Study., 2016 George Washington University
Pertussis-Associated Pneumonia In Infants And Children From Low- And Middle-Income Countries Participating In The Perch Study., Breanna Barger-Kamate, Maria Deloria Knoll, E Wangeci Kagucia, Christine Prosperi, Henry C Baggett, Daniel E. Park, +31 Additional Authors
Epidemiology and Biostatistics Faculty Publications
BACKGROUND: Few data exist describing pertussis epidemiology among infants and children in low- and middle-income countries to guide preventive strategies.
METHODS: Children 1-59 months of age hospitalized with World Health Organization-defined severe or very severe pneumonia in 7 African and Asian countries and similarly aged community controls were enrolled in the Pneumonia Etiology Research for Child Health study. They underwent a standardized clinical evaluation and provided nasopharyngeal and oropharyngeal swabs and induced sputum (cases only) for Bordetella pertussis polymerase chain reaction. Risk factors and pertussis-associated clinical findings were identified.
RESULTS: Bordetella pertussis was detected in 53 of 4200 (1.3 ...
Cost Of Care For Hospitalized Patients With Pulmonary Mycobacterial Diseases In The United States., 2016 University of Louisville
Cost Of Care For Hospitalized Patients With Pulmonary Mycobacterial Diseases In The United States., Mary Beth Wells Allen
Electronic Theses and Dissertations
Background: Pulmonary mycobacterial diseases describe both tuberculosis (TB) and nontuberculous mycobacteria (NTM). Few data are available measuring the cost burden of mycobacterial diseases on the national level. The purpose of this study was to evaluate the cost burden and measure emerging trends in hospitalization of pulmonary TB and NTM in the US from 2001 through 2012. Methods: This study was a retrospective community based cost analysis of hospitalized patients with a principal diagnosis of pulmonary mycobacterial diseases from 2001 through 2012. Data for pulmonary TB and NTM were retrieved from the Healthcare Cost and Utilization Project (HCUP), US Department of ...
Tb Screening Guidelines For Transitional Care Unit, 2016 Murray State University
Tb Screening Guidelines For Transitional Care Unit, Caleb E. Newcomer
The basis of this research was the formation of new TB screening and risk assessment guidelines on a Transitional Care Unit within a medical center. Current evidence-based research studies helped to guide the recommendations for the policy changes based on their results and findings. The most pertinent policy changes are the treatment offered for patients suspected with HIV, the rigorous use of the Risk Assessment Tool, and BAMT testing for TB.
Path To Resistance: Risk Factors Associated With Carbapenem-Resistant Pseudomonas Aeruginosa, 2016 Department of Internal Medicine, Aurora Sinai Medical Center
Path To Resistance: Risk Factors Associated With Carbapenem-Resistant Pseudomonas Aeruginosa, Kushal Patel, Jessica J.F. Kram, Dennis J. Baumgardner
Journal of Patient-Centered Research and Reviews
Background: An estimated 51,000 health care-associated Pseudomonas aeruginosa infections occur in the United States annually. More than 13% are secondary to non-carbapenem multidrug-resistant strains, which result in 400 yearly deaths. Traditional risk factors for resistance include ICU stay, mechanical ventilation, previous hospitalization and major comorbidities. As microbes evolve, risk factors also may evolve.
Purpose: To determine if traditional and/or new risk factors for P. aeruginosa resistance are valid and predictive of infection with carbapenem-resistant P. aeruginosa.
Methods: We retrospectively studied inpatients and outpatients ≥ 18 years old who presented to an Aurora Health Care facility with a positive P ...
Novel Mutation Of Interferon-Γ Receptor 1 Gene Presenting As Early Life Mycobacterial Bronchial Disease, 2016 George Washington University
Novel Mutation Of Interferon-Γ Receptor 1 Gene Presenting As Early Life Mycobacterial Bronchial Disease, Maria J. Gutierrez, Neelu Kaira, Alexandra Horwitz, Gustavo Nino
Pediatrics Faculty Publications
Mendelian susceptibility to mycobacterial diseases (MSMD) are a spectrum of inherited disorders characterized by localized or disseminated infections caused by atypical mycobacteria. Interferon-γ receptor 1 (IFNGR1) deficiency was the first identified genetic disorder recognized as MSMD. Mutations in the genes encoding IFNGR1 can be recessive or dominant and cause complete or partial receptor deficiency. We present the case of a 2½-year-old boy with a history of recurrent wheezing, diagnosed with endobronchial mycobacterial infection. Immunological workup revealed a homozygous nonsense mutation in the IFNGR1 gene, a novel mutation predicted in silico to cause complete IFNGR1 deficiency. This case demonstrates that (a ...
When It Isn’T Always Lyme: Expanding The Differential Diagnosis For Acute-Onset Polyarthralgia In The West Virginia Eastern Panhandle, Natalie A. Moffett, Rosemarie Lorenzetti
Marshall Journal of Medicine
This case presentation discusses a 36 year-old female animal care worker presenting with an acute-onset polyarthropathy during the summer months in a Lyme endemic region. Though she appeared to be a good candidate for the diagnosis of Lyme borreliosis, her screening serology reported negative results and alternative diagnoses were considered. Her subsequent diagnosis with parvovirus B19 acts to remind the general practitioner to have confidence in the accuracy of a negative Lyme screen and, upon negative result, to expand the differential to include less common infections including parvovirus B19. It also highlights the need to remember parvovirus B19 in a ...
Distinct Surveillance Pathway For Immunopathology During Acute Infection Via Autophagy And Sr-Bi, 2016 Ludwig-Maximilians-Universitat
Distinct Surveillance Pathway For Immunopathology During Acute Infection Via Autophagy And Sr-Bi, Susanne Pfeiler, Eicke Latz, Bernd Engelmann
Open Access Articles
The mechanisms protecting from immunopathology during acute bacterial infections are incompletely known. We found that in response to apoptotic immune cells and live or dead Listeria monocytogenes scavenger receptor BI (SR-BI), an anti-atherogenic lipid exchange mediator, activated internalization mechanisms with characteristics of macropinocytosis and, assisted by Golgi fragmentation, initiated autophagic responses. This was supported by scavenger receptor-induced local increases in membrane cholesterol concentrations which generated lipid domains particularly in cell extensions and the Golgi. SR-BI was a key driver of beclin-1-dependent autophagy during acute bacterial infection of the liver and spleen. Autophagy regulated tissue infiltration of neutrophils, suppressed accumulation of ...
Type I Interferon Induction By Neisseria Gonorrhoeae: Dual Requirement Of Cyclic Gmp-Amp Synthase And Toll-Like Receptor 4, 2016 University of Massachusetts Medical School
Type I Interferon Induction By Neisseria Gonorrhoeae: Dual Requirement Of Cyclic Gmp-Amp Synthase And Toll-Like Receptor 4, Warrison A. Andrade, Sarika Agarwal, Shunyan Mo, Scott A. Shaffer, Joseph P. Dillard, Tobias Schmidt, Veit Hornung, Katherine A. Fitzgerald, Evelyn A. Kurt-Jones, Douglas T. Golenbock
Katherine A. Fitzgerald
The innate immune system is the first line of defense against Neisseria gonorrhoeae (GC). Exposure of cells to GC lipooligosaccharides induces a strong immune response, leading to type I interferon (IFN) production via TLR4/MD-2. In addition to living freely in the extracellular space, GC can invade the cytoplasm to evade detection and elimination. Double-stranded DNA introduced into the cytosol binds and activates the enzyme cyclic-GMP-AMP synthase (cGAS), which produces 2'3'-cGAMP and triggers STING/TBK-1/IRF3 activation, resulting in type I IFN expression. Here, we reveal a cytosolic response to GC DNA that also contributes to type I ...
Tuberculosis Susceptibility And Vaccine Protection Are Independently Controlled By Host Genotype, 2016 University of Massachusetts Medical School
Tuberculosis Susceptibility And Vaccine Protection Are Independently Controlled By Host Genotype, Clare M. Smith, Megan K. Proulx, Andrew J. Olive, Dominick Laddy, Bibhuti B. Mishra, Caitlin Moss, Nuria Martinez, Michelle M. Bellerose, Palmira Barreira-Silva, Jia Yao Phuah, Richard E. Baker, Samuel M. Behar, Hardy Kornfeld, Thomas G. Evans, Gillian Beamer, Christopher M. Sassetti
Open Access Articles
The outcome of Mycobacterium tuberculosis infection and the immunological response to the bacillus Calmette-Guerin (BCG) vaccine are highly variable in humans. Deciphering the relative importance of host genetics, environment, and vaccine preparation for the efficacy of BCG has proven difficult in natural populations. We developed a model system that captures the breadth of immunological responses observed in outbred individual mice, which can be used to understand the contribution of host genetics to vaccine efficacy. This system employs a panel of highly diverse inbred mouse strains, consisting of the founders and recombinant progeny of the "Collaborative Cross" project. Unlike natural populations ...
There Is A Trend Favoring Vancomycin Vs. Metronidazole In Treating Severe C. Difficile Infection, 2016 Wayne State University School of Medicine
There Is A Trend Favoring Vancomycin Vs. Metronidazole In Treating Severe C. Difficile Infection, Dean D. Fouchia
Clinical Research in Practice: The Journal of Team Hippocrates
A critical appraisal and clinical application of Johnson S, Louie TJ, Gerding DN, et al. Vancomycin, metronidazole, or tolevamer for Clostridium difficile infection: results from two multinational, randomized, controlled trials. Clin Infect Dis. 2014;59(3):345-354. doi: 10.1093/cid/ciu313
Dynamic Host-Pathogen Interactions Result In Fungal Epitope Unmasking, 2016 University of Maine
Dynamic Host-Pathogen Interactions Result In Fungal Epitope Unmasking, Alex Hopke
Electronic Theses and Dissertations
Molecular camouflage is used by a diverse set of pathogens to disguise their identity and avoid recognition by protective host receptors. The opportunistic fungal pathogen Candida albicans is a good example, as it masks the inflammatory component β-glucan in its cell wall to evade detection by the immune receptor Dectin-1. Interestingly, it has been seen that β-glucan becomes unmasked during infection in vivo, though the underlying mechanisms remained unclear. Exposure levels of this epitope may be important, as Dectin-1 mediates protection from some strains of C. albicans and alterations in the organization and composition of the Candida cell wall can ...
Potency Of A Human Monoclonal Antibody To Diphtheria Toxin Relative To Equine Diphtheria Anti-Toxin In A Guinea Pig Intoxication Model, 2016 University of Massachusetts Medical School
Potency Of A Human Monoclonal Antibody To Diphtheria Toxin Relative To Equine Diphtheria Anti-Toxin In A Guinea Pig Intoxication Model, Heidi L. Smith, Peter S. Cheslock, Mark Leney, Bruce A. Barton, Deborah C. Molrine
Pediatric Publications and Presentations
Prompt administration of anti-toxin reduces mortality following Corynebacterium diphtheriae infection. Current treatment relies upon equine diphtheria anti-toxin (DAT), with a 10% risk of serum sickness and rarely anaphylaxis. The global DAT supply is extremely limited; most manufacturers have ceased production. S315 is a neutralizing human IgG1 monoclonal antibody to diphtheria toxin that may provide a safe and effective alternative to equine DAT and address critical supply issues. To guide dose selection for IND-enabling pharmacology and toxicology studies, we dose-ranged S315 and DAT in a guinea pig model of diphtheria intoxication based on the NIH Minimum Requirements potency assay. Animals received ...
The Activity Of Antimicrobial Surfaces Varies By Testing Protocol Utilized, 2016 Northeastern University
The Activity Of Antimicrobial Surfaces Varies By Testing Protocol Utilized, Matias D. Campos, Paola C. Zucchi, Ann Phung, Steven N. Leonard, Elizabeth B. Hirsch
Pharmacy Faculty Scholarship
Background: Contaminated hospital surfaces are an important source of nosocomial infections. A major obstacle in marketing antimicrobial surfaces is a lack of efficacy data based on standardized testing protocols. Aim: We compared the efficacy of multiple testing protocols against several “antimicrobial” film surfaces.
Methods: Four clinical isolates were used: one Escherichia coli, one Klebsiella pneumoniae, and two Staphylococcus aureus strains. Two industry methods (modified ISO 22196 and ASTM E2149), a “dried droplet”, and a “transfer” method were tested against two commercially available antimicrobial films, one film in development, an untreated control, and a positive (silver) control film. At 2 (only ...