Bacteria Commons^™

Comparison Of Ecg Features, Cardiac Biomarkers, And Clinical Outcomes In Three Waves Of Hospitalized Covid-19 Pneumonia Patients With Cardiovascular Events, Yuchen Han, Jahnavi Sunkara, Tshura S Ali, Harideep Samanapally, Vidyulata Salunkhe, Fnu Deepti, Emma C. Huang, Justin J. Huang, Maiying Kong, Jiapeng Huang

The University of Louisville Journal of Respiratory Infections

Background

Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2) is a rapidly evolving virus that can severely impact the cardiovascular system. With new variants, it is important to characterize wave-specific (defined by dominant circulating variants) clinical changes.

Methods

A multi-center retrospective cohort study of patients hospitalized with SARS-CoV-2 community acquired pneumonia at eight adult acute-care hospitals in the city of Louisville, KY was conducted. Patients hospitalized with Coronavirus Disease 2019 (COVID-19) community acquired pneumonia who experienced a cardiovascular event between March 2020 and July 2022 were included in this analysis. Variant assignment was based on temporal prevalence rather than genomic confirmation, and …

Adhesion Of Antibiotic-Resistant Bacteria To Thermoplastic Materials Used In Fabricating Medical Devices: Patient Consequences, Dev V. Mehta

Poster Presentations

Burn injury patients wear supportive orthoses made by heat-forming sheets of thermoplastic material (Figs. 1 & 2). Bacteria cause severe soft tissue infections in patients wearing contaminated orthoses. Thermoplastic medical devices can develop biofilms that include antibiotic-resistant (AR) bacteria, which significantly reduces the number of available treatment options. A biofilm is a community of microorganisms that share resources allowing them to exist in a nutrient-limited environment. Biofilm microbes secrete extracellular polymeric substance (EPS) that attaches them firmly to a substrate surface while protecting them from harmful substances, including antibiotics. Bacteria living within biofilms on inanimate surfaces can survive for extended …

Comparative Investigation Of Bacterial Adhesion On Medical Device Thermoplastics, Dev V. Mehta

Honors Theses

This project will focus on determining if differences in bacterial cell wall composition influences adhesiveness to thermoplastic materials used to construct patient orthotic splints. Bacteria with decreased adhesion are unable to remain bonded to orthotic splints, increasing its ability to transfer to a patient’s wound, leading to an infection. Antibiotic resistant bacteria used in this investigation included gram-positive cocci vancomycin-resistant (VRE) Enterococcus faecalis, methicillin-resistant Staphylococcus aureus (MRSA), and gram-negative rods extended-spectrum beta-lactamase (ESBL) Escherichia coli and Pseudomonas aeruginosa. Each test bacterium is a major pathogen causing healthcare-associated infections (HAIs). Saline, artificial perspiration, and ascites fluids were used to determine the …

Identifying Major Sources Of Leptospira Interrogans In San Juan Bay And Río Grande De Loíza Estuaries Of Puerto Rico, Logan Mccullers, Dave Bachoon

Biology Theses

This study evaluated the presence of pathogenic Leptospira interrogans, potential carriers, and environmental factors influencing their occurrence in the San Juan Bay Estuary (SJBE) and Río Grande de Loíza (RGDL) watersheds of Puerto Rico from 2024–2025. Detection of this pathogen from water samples was performed using the lipL32 PCR assay. The likely hosts of L. interrogans were determined using fecal source tracking (FST) assays for human (HF-183), canine (BacCan-UCD), equine (HoF597), and rat mitochondrial DNA NADH dehydrogenase subunit 2 gene (RatMt) markers. In 2024, 91 samples were collected (March: 50; June: 41), and in 2025, 124 samples were collected …

Investigating Corollaries Between Streptococcus Gallolyticus Subsp. Gallolyticus Virulence And Colorectal Cancer, Tyler G. Myers

Pursuit - The Journal of Undergraduate Research at The University of Tennessee

Streptococcus gallolyticus subsp. gallolyticus (Sgg) is a gram-positive, non-beta-hemolytic bacterium that belongs to the Lancefield group D of streptococcal pathogens. For the past several decades, associations between Sgg bacteremia and colorectal cancer (CRC) have been apparent, with gastroenterologists routinely recommending colonoscopies for positive cases of Sgg in either blood or stool samples. However, current research has not wholly established whether Sgg acts as a causative agent of CRC or if pre-existing cancers make the lumen of the colon more hospitable to its colonization. Regardless, Sgg has been implicated in the modulation of host inflammatory pathways and subsequent remodeling …

A Rare And Challenging Polymicrobial Pleural Infection Involving Cupriavidus Pauculus In A Patient With Rheumatoid Arthritis And Multiple Complications, Moiz Ahmed Khan, Syeda Samiya Kamal, Muhammad Muneeb, Summaya Zafar

The University of Louisville Journal of Respiratory Infections

A 58-year-old female with a 15-year history of rheumatoid arthritis (RA) and a history of treatment consisting of methotrexate, hydroxychloroquine, leflunomide, and chronic prednisolone therapy, presented with fever, productive cough, dyspnea, and left leg cellulitis. She developed septic shock complicated by tension pneumothorax requiring emergency thoracostomy and non-ST-elevation myocardial infarction (NSTEMI). Pleural fluid culture grew Cupriavidus pauculus, a rare environmental gram-negative bacillus, alongside Burkholderia cepacia and Candida parapsilosis, indicating polymicrobial infection which was most likely predisposed by patient's immunosuppressed state from RA and prolonged steroid use. Treatment consisted of trimethoprim/sulfamethoxazole, meropenem, fluconazole, and cardiopulmonary support, and culminated in …

Late Bioprosthetic Valve Migration- A Rare Entity After Tavi, Sahej Arora, Ghazi Khan, Jeremiah Depta

Advances in Clinical Medical Research and Healthcare Delivery

We present a case of hemolytic anemia due to a rare complication of late bioprosthetic valve migration, who underwent successful treatment with valve in valve transcatheter aortic valve implantation. Our patient with symptomatic moderate aortic stenosis underwent the index procedure a year ago and treated for bacteremia 3 months ago, presented with hemolytic anemia and echocardiography revealing aortic paravalvular leak. The hemolysis was attributed to Bioprosthetic valve dysfunction after a negative hematological workup. The patient's aortography revealed ventricular migration of the valve, not seen on a cardiac CT scan performed before. This was followed by a successful valve in valve …

Adaptive Compulsion, Amanda A. Santos

Electronic Theses, Projects, and Dissertations

Adaptive

Adjective

Adap.tive ( ə-ˈdap-tiv)

of, relating to, or being a heritable trait that serves a specific function and improves an organism's fitness or survival

Compulsion

Noun

Com.pul.sion (kəm-ˈpəl-shən)

a repetitive behavior or mental act that a person feels driven to perform to alleviate the anxiety and distress caused by an unwanted thought or urge, known as an obsession.

For years we have lived in unprecedented times. From the worldwide quarantine in 2020 resulting from the pandemic, to our current US political crisis. The constant barrage of events is overwhelming and demoralizing.

The work in this gallery is a display …

Acute Gastropericardial Fistula With Cardiac Tamponade And Septic Pericarditis Due To Helicobacter Pylori–Induced Gastric Ulcer Perforation, Stephen J. Bordes, Christopher D. Oubre, Preethi H. Kanumuri, Nicholas Leblanc, Richard Lewis, Thomas Marsden, Terry Stelly

School of Medicine Faculty Publications

No abstract provided.

Should We Subtype Gastric Intestinal Metaplasia In Gastric Biopsies, A Single Institution's Experience, Haibo Wang, Yu Liu, Asra Feroze, Zengying Wu, Jonathan D. Somma, Zhiyan Fu

School of Medicine Faculty Publications

Gastric intestinal metaplasia (GIM) is considered a risk factor for gastric dysplasia and adenocarcinoma. While surveillance endoscopies are often performed, particularly for incomplete GIM, the clinical value of histologic subtyping (complete, incomplete, or mixed) remains unclear. This study evaluated the progression risk of different GIM subtypes diagnosed through random gastric biopsies and their association with various clinical factors. Archived pathology data from 206 gastric biopsy cases were analyzed, including 52 negative controls, 56 complete GIM, 54 incomplete GIM, and 44 mixed GIM. Histologic slides were reviewed for subtype confirmation and other pathological changes; clinical data were extracted from medical records. …

Genome Sequence Of Lacticaseibacillus Paracasei G277-1.1, A Clinical Strain That Forms Enhanced Biofilms With Streptococcus Mutans, Xiaochang Huang, Hemendra Pal Dhaked, Yihong Li, Zezhang T. Wen

School of Dentistry Faculty Publications

Lacticaseibacillus paracasei G277-1.1 was isolated from dental plaque of a patient with severe early childhood caries. It forms synergistic biofilms with Streptococcus mutans in vitro. Here, we report its high-quality genome sequence, revealing insights on its inter-species interaction with S. mutans.

Host, Microbiome, And Parasite: How Apicomplexan Microorganisms Interact With Gut Microbiota, Senia Bu, Andrew T. Ozga

Mako: NSU Undergraduate Student Journal

The gut microbiome, a complex ecosystem of microorganisms residing in the human gastrointestinal tract, plays a crucial role in maintaining overall health. It functions in immune system regulation, digestion, and protection against pathogens. Apicomplexan parasites, such as Toxoplasma gondii, Plasmodium spp., and Cryptosporidium spp., are major pathogens that can significantly disrupt the gut microbiota, leading to alterations in microbial composition and function. This review explores the bidirectional interactions between Apicomplexan parasites and the gut microbiome, focusing on how these parasites influence microbial diversity, immune responses, and host metabolism. It examines the mechanisms by which infection-induced inflammation, altered …

Synergistic Cefiderocol-Containing Antibiotic Combinations Active Against Highly Drug-Resistant Acinetobacter Baumannii Patient Isolates With Diverse Resistance Mechanisms, Justin Halim, Andrew P. Keane, Jeannete Bouzo, Tope Aderibigbe, Jessica A. Chicola, Katie T. Nolan, Keertana Jonnalagadda, Jason X. Tran, Valerie J. Carabetta

Rowan-Virtua School of Osteopathic Medicine Departmental Research

BACKGROUND: Acinetobacter baumannii is a nosocomial pathogen known for rapidly developing resistance to nearly all antibiotics, including last-line agents. Cefiderocol, a novel siderophore cephalosporin, has shown in vitro activity against A. baumannii and is now used clinically, but resistance is emerging. Data on cefiderocol-based antibiotic combinations are limited.

OBJECTIVES: To evaluate the in vitro activity of cefiderocol alone and in combination with other antibiotics against XDR and PDR A. baumannii clinical isolates, and to explore resistance mechanisms underlying cefiderocol synergy.

METHODS: We tested 21 XDR/PDR clinical isolates and one NDM-1-producing strain using broth microdilution and checkerboard assays with cefiderocol and …

Case Report: Sarcina Ventriculi, A Masquerade Of Motility, Katherine Westbrook Cates, Catherine Hudson

School of Medicine Faculty Publications

Sarcina ventriculi is a rare bacterium that has the potential to cause severe disease in the gastric mucosa. According to our search, there are less than 100 prior published case reports. This case discusses a 69-year-old man who presented to the hospital with severe gastric distention noted on CT of the abdomen with intractable nausea and emesis, for which endoscopy was performed and ruled out gastric outlet obstruction, with biopsies resulting as S. ventriculi. This bacterium has previously been reported to cause gastric dysmotility, as well as severe side effects including gastric perforation.

Addressing Socioeconomic Disparities In The Treatment Of Antimicrobial-Resistant Infections: The Role Of Pharmacists In Mitigating Barriers, Arin Wade, Danielle Egbujor, Anna Spalvieri, Owen Fox, Marisa Petrunich, Joshua Honaker, Samantha Mccord, Kasie Landin

Pharmacy and Wellness Review

Antimicrobial resistance is an escalating global threat driven by inappropriate antibiotic use and shaped by socioeconomic disparities. Social determinants of health, including limited healthcare access, poverty, low health literacy, and environmental conditions, contribute to higher rates of resistant infections and poorer treatment outcomes in underserved populations. Barriers such as pharmacy deserts, self-medication, and inadequate stewardship infrastructure amplify these risks. Pharmacists, as accessible and highly trained healthcare professionals, play a critical role in combating antimicrobial resistance by optimizing antibiotic use, delivering culturally competent education, and leading antimicrobial stewardship programs across settings. Community and clinical pharmacists are especially well positioned to bridge …

A Retrospective Study Of Pulmonary Function Tests In Bronchiectasis: An Infectious Disease Of The Respiratory System, Vinod Mutkule, Mahesh Shinde, Vidya Bapmare, Sangramsingh Dixit, Atharva Sharma, Kshitij Sarwey, Yogeshwari Patil, Sanket Jethlia, Aayushi Dwivedi, Disha Pardeshi, Anmol Rai, Kunal Shah, Vidhi Kalwar

The University of Louisville Journal of Respiratory Infections

Introduction: Bronchiectasis, currently being recognized worldwide, is an abnormal dilatation of the bronchi and bronchioles brought on by recurrent cycles of inflammation and airway infection. Impaired pulmonary function has a predictive significance in bronchiectasis. When treating patients with suspected or confirmed respiratory diseases, pulmonary function tests (PFT) are useful examinations. Very few studies have been done on PFTs in bronchiectasis. The main aim of this study is to study PFTs in bronchiectasis.

Method: This is a retrospective observational study done on 50 patients over two years at the tertiary care center. The previous records of patients were collected from the …

A Modified Sir Model Used To Investigate The Relationship Between Congenital And Adult Syphilis, Kaleesta R. Waysman

Honors Thesis

A complex SIR model integrating the relationship between adult and congenital syphilis was developed. The goal of the project was to determine the specific population(s) or control strategies that should be enforced, altered, or removed to decrease the number of children experiencing clinical sequelae due to congenital syphilis. Early clinical sequelae include hydrops fetalis, preterm birth, central nervous system infection, hepatosplenomegaly, hyperbilirubinemia, cholestasis, hemolytic anemia, snuffles, osteochondritis, and lesions or rashes in the palms and soles. Late clinical sequelae include interstitial keratitis, hearing loss, Hutchinson teeth, saber shins, Clutton joints, mulberry molars, and saddle nose. After implementing real-world data into …

Personalizing Intermittent Fasting: The Role Of Microbiome Diversity And Fiber Intake In Shaping Health Outcomes, Jana Gjini, Robin Moore, Venkateswar Venkataraman

Rowan-Virtua Research Day

BACKGROUND: Intermittent fasting (IF) has been linked to improved metabolic health, reduced inflammation, and increased longevity in animal models. These effects are thought to be mediated through changes in the gut microbiome. Murine studies consistently show that IF enhances microbial diversity and promotes beneficial species like Lactobacillus and Bifidobacterium, improving metabolic profiles and gut barrier function. However, human studies reveal inconsistent results, suggesting that individual-level factors such as baseline microbiome composition and fiber intake may influence response to IF.

HYPOTHESIS: Baseline gut microbiome diversity and habitual dietary fiber intake modulate the metabolic and inflammatory benefits of intermittent fasting in humans. …

Clinical Characteristics And Outcomes Of Pediatric Staphylococcal Scalded Skin Syndrome (Ssss) At An Inner-City Tertiary Care Center, Nina Kb Gust Md, Ashley Frei Bs, Rebecca M. Adams Bs, Elika Ridelman Phd, Christina Shanti Md, Ronald Thomas Phd, Jocelyn Y. Ang Md

Medical Student Research Symposium

Introduction

Staphylococcal Scalded Skin Syndrome (SSSS) is a blistering skin condition caused by a toxin-producing staphylococcus species. Epidemiologic studies on pediatric SSSS in the United States are limited, with a reported incidence of 7.67 cases per million children and 45.1 per million infants. Immature renal function, lack of protective antibodies, and increased exotoxin target desmoglein-1 are hypothesized to increase incidence in younger children. We aimed to determine clinical and microbiological characteristics of pediatric SSSS and factors that could help predict disease severity.

Methods

A retrospective chart review was performed for admitted patients under 18 years old diagnosed with SSSS from …

The Role Of Horizontal Gene Transfer In Antibiotic Resistance Amidst Prevalent Community And Healthcare-Associated Mrsa Rates, Gabrielle Nascimento

Honors College Theses

In recent decades, cases of community-acquired MRSA (CA-MRSA) and healthcare-associated MRSA (HA-MRSA) have been on the rise. The ability of antibiotic resistance to transfer between microorganisms greatly expands its threat to the effective treatment and containment of bacterial infections. The mecA gene is found on a mobile cassette within the Staphylococcal cell and encodes for PBP2a, an alternate version of penicillin-binding protein (PBP) with less binding affinity for β-lactam antibiotics, increasing resistance to the effects of antibiotics. The goal of this research is to investigate the horizontal transfer of the mecA gene between various Staphylococcus species as well as to …

An E. Coli Two-Hybrid System To Investigate Human Protein-Protein Interactions, Rebecca M. Richardson, Sarah M. Ho, Lane Tong, Morgan G. Daniels, Steven M. Pascal

Chemistry & Biochemistry Faculty Publications

Abstract

The LexA-E. coli two-hybrid (LexA-E2H) system was initially developed to study interactions between microbial proteins in an Escherichia coli (E. coli) environment. We here demonstrate its utility for studying mammalian protein interactions. Specifically, this study uses LexA-E2H to provide the first direct and quantitative validation of Glucose Regulated Protein 78 (GRP78) binding to the cleaved-Prostate Apoptosis Response 4 (cl-Par-4) tumor suppressor. Furthermore, the results establish that this interaction does not require phosphorylation of either protein. MacConkey agar was used for initial detection of the interaction through colorimetric colony screening, distinguishing pale white-pink colonies (+ interaction) from …

Design, Synthesis, And Nmr-Guided Characterization Of A Targeted Covalent Inhibitor-Like Molecule Against Ivyp1 From P. Aeruginosa, Samuel Taylor Moore

Master's Theses

Multi-drug resistance poses a serious threat to future generations and historical antibiotic pipelines; consequently, the medical and economic burdens associated with treating multidrug-resistant bacteria are substantiated. In this context, P. aeruginosa (PA) emerges as one of the most significant healthcare challenges, being a leading cause of resistance-associated mortality worldwide. Despite modern efforts to combat these poor outcomes, drug-resistant cases continue to rise, and the need for novel antibiotic treatment is apparent. To this end, we investigated relevant resistance mechanisms and past antibiotic targets within PA, and in doing so, we identified relationships between peptidoglycan biology and a periplasmic protein, Inhibitor …

Synovial Fluid Cutibacterium Acnes Antigen Is Detected Among Shoulder Samples With High Inflammation And Early Culture Growth, Krista Toler, Pearl Paranjape, Alex Mclaren, Thomas Jefferson University

Rothman Institute Papers

Background: An emerging paradigm suggests that positive Cutibacterium acnes shoulder cultures can result from either true infection or contamination, with true infections demonstrating a host inflammatory response and early culture growth. This clinical retrospective study examines the relationship between C. acnes antigen, C. acnes culture results, and inflammation.

Methods: From January 2021 to July 2023, 1,365 periprosthetic synovial fluid samples from 347 institutions were tested for shoulder infection at a centralized clinical laboratory. A biomarker scoring system based on the 2018 International Consensus Meeting (ICM) definition was utilized to assign each sample an inflammation score. Associations between inflammation, culture results, …

Molecular Detection Of Pathogenic Bacteria In American Dog Ticks (Dermacentor Variabilis) In Brown County, Nebraska, Nicole Messbarger, Darby Carlson, Keith Geluso, Julie Shaffer

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

Ticks carry and transmit disease pathogens that cause many human illnesses. Many of these diseases in humans are accompanied by a wide variety of symptoms making tick-borne illnesses often difficult to diagnose. The rate of reported tick-borne illnesses in humans has increased during the past decades in the United States, alongside a rise in concern for public health and safety. In northern Nebraska, the American dog tick (Dermacentor variabilis) is the primary tick encountered by humans and domestic animals in the region. This species is a known vector for spotted fever group (SFG) rickettsioses and tularemia (Francisella …

The Physiological Significance Of Nitric Oxide Synthase In Staphylococci, Ryan M. Singh

Theses & Dissertations

Staphylococci, particularly Staphylococcus epidermidis, are common causes of implant-associated infections that may result in notable morbidity and mortality. One of the ways the innate immune system attempts to combat these invading pathogens is via the respiratory burst, in which free radical species such as nitric oxide (NO^•), toxic to bacterial respiration, are released in large quantities. Despite the toxicity of NO^•, some bacteria, including staphylococci, encode an endogenous bacterial nitric oxide synthase (bNOS), whose physiological role has been unclear until now. In this dissertation, we demonstrate that S. epidermidis is able to overcome the toxicity …

Clostridium Perfringens Sepsis From A Hepatic Abscess With Hemolysis And Renal Failure, Requiring Hemodialysis, Joel Collins Ii, Katelyn Courtney, James A. Espinosa, Alan Lucerna

Rowan-Virtua Research Day

The prognosis of sepsis caused by Clostridium perfringens is extremely poor, with a mortality rate of 70%-100%. Management includes antibiotic regimens specific to toxin production as well as source control via surgical or interventional mechanisms. We report a case of a 64-year-old male who presented with right upper quadrant (RUQ) abdominal pain and was diagnosed with Clostridium perfringens bacteremia with associated acalculous cholecystitis, hepatic abscess, and acute renal failure requiring hemodialysis. It is felt that early hemodialysis was an associated factor in the patient's survival.

Gut Microbiota Changes After Cholecystectomy: Unraveling The Microbial Mysteries - A Systematic Review, Maftuna Kurbonnazarova, Arthi Rameshkumar, Olivia R. Siciliano, Samrat Gollapudi, Katarina Rusinak, Alissa Brotman O’Neill

Rowan-Virtua Research Day

Aims: This review aims to expand upon previous research examining change in gastrointestinal microbiota before and after cholecystectomy.

Methods: A systematic review, combined with a pooled analysis, was conducted to assess gut microbiota dysbiosis post-cholecystectomy, utilizing 71 articles retrieved from 3 databases, with 13 undergoing full-text appraisal. The publication dates ranged from 2018 to 2023.

Results: Results suggested a greater degree of microbiota alteration in symptomatic post-cholecystectomy patients, characterized by a decrease in the Firmicutes/Bacteroidetes ratio, Bifidobacterium and Lactococcus, alongside increased levels of harmful microbiota such as Prevotella, Sutterella, Proteobacteria, Verrucomicrobia, Blautia obeum, and Veillonella species. Interestingly, an increase in …

Evaluation Of The Efficacy Of Novel Drugs And Combinations Against Extensively- And Pan-Drug Resistant Acinetobacter Baumannii Isolates, Keertana Jonnalagadda, Rachel Carr, Valerie Carabetta

Rowan-Virtua Research Day

Acinetobacter baumannii, a Gram-negative, nosocomial, opportunistic pathogen is commonly infectious in immunocompromised patients. More specifically patients develop healthcare-associated infections (HAI) spanning beyond sepsis, pneumonia, meningitis, and urinary tract infections. Due to its rapid ability to acquire antibiotic resistance, it has raised the necessity to discern a novel therapeutic treatment that can be effectively used against the multidrug resistant (MDR) A. baumannii. Cooper University Hospital (CUH) faced an increased case load of patients that were infected with MDR A. baumannii. The patient isolates obtained from CUH were highly resistant to the 22 standard-of-care antibiotics. With the recent introduction …

Analysis Of Antibiotic Sensitivity Patterns In Pasteurellaceae Family Isolates: A Microbial And Molecular Investigation, Jillian Barron

Honors Scholar Theses

Bacteria in the Pasteurellaceae family are known to cause disease in both human and animal species. Like all species of bacteria, the pathogens in the Pasteurellaceae family evolve and acquire antimicrobial-resistant traits. Antimicrobial resistance of bacteria is a significant public health concern, as treatment of resistant pathogens becomes more difficult, if not impossible, with current medical capabilities. In this project, phenotypic and genotypic analyses were performed on Pasteurellaceae family isolates sourced from the Connecticut Veterinary Medical Diagnostic Laboratory. Phenotypic antibiotic sensitivity patterns of each isolate were assessed against a panel of antibiotics through a Kirby-Bauer disk diffusion test. Disk diffusion …

Typhlitis In A Neutropenic Patient, Alice He Bs, Wern Lynn Ng Md, Lay She Ng Md, Si Yuan Khor Md, Chandi Garg Md

Tower Health Research Day

No abstract provided.