Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"pathogen prevalence"”.
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Associations between MHC class I variation and blood pathogen prevalence in caracal
… the vertebrate adaptive immune response to pathogens through the recognition and presentation of foreign peptides, and thus provide an informative genetic marker for studying the adaptive potential of species with respect to disease. MHC class I loci mediate the immune system's recognition …
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Estimating host species and spatial variation in infection with the fungal pathogen that causes snake fungal disease
… efforts. Impacts of emerging multi-host pathogens can vary greatly among species as well as geographically, and understanding which populations will be at greatest risk is essential for conserving biodiversity. Snake fungal disease (SFD), caused by the fungal pathogen Ophidiomyces …
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Environmental Factors and Management Practices that Influence Salmonella and Listeria Prevalence at the Sub-Field Level on an Eastern Shore of Virginia Farm
Prior research has shown pathogen prevalence on-farms is not uniformly distributed, instead pathogen prevalence is highly dependent on environmental factors and management practices. A study was performed to determine environmental factors (e.g., landscape features, meteorological events) and …
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Maintaining pathogens with short infectivity in seasonally structured tick populations: relative importance of three transmission pathways
Infectivity periods of different tick-borne pathogens in host species can vary widely, and the variation affects how the pathogens are maintained in tick populations. In addition to systemic and vertical transmission, cofeeding transmission has been proposed as an important route for the …
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Exploring Mosquito Thermal Biology and Chemical Ecology in the Context of Host-Seeking and Climate Change
… thousands of lives annually due to the various pathogens they transmit, which result in diseases including dengue, malaria, and Zika. While various strategies and practices are in place to manage mosquito populations, these methods may be challenged due to a rise in insecticide resistance in …
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Factors Influencing The Ecology and Epidemiology of Microbial Indicators and Foodborne Pathogens In Surface Waters and Development of Risk Mitigations
… the ecology and epidemiology of foodborne pathogens and fecal indicator bacteria (FIB) by growing regions, sample types, scale of analysis, and detection method is essential for developing targeted mitigation strategies. This dissertation utilized quantitative research methods and …
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Determining the role of density-dependent effects in disease induced population impacts
… in wildlife, often due to the complex nature of pathogen transmission in muti-host systems that can lead to varied decline and recovery patterns. Common disease management strategies focus on the reduction of pathogen transmission at low host densities to be effective. Density-dependent contact …
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EFFECTS OF PLANT GROWTH-PROMOTING MICROORGANISMS ON MICROBIAL COMMUNITY DYNAMICS AND PLANT GROWTH RESPONSES OF AEROPONICALLY CULTIVATED SPINACH
… in nutrient application, power loss, and rapid pathogen spread. Adding Vermicompost (VCT) and plant growth-promoting microorganisms (PGPM) offers a potential solution by improving nutrient efficiency, resulting in higher yields, improved nutritional value, and reduced pathogenesis. Spinach was …
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A community modeling approach to understanding the ecology of Lyme disease
… is responsible for transmitting the Lyme disease pathogen (Borrelia burgdorferi) to humans in eastern North America. Since the 1970s, the geographic distributions of both the pathogen and the black-legged tick have expanded throughout the US. This expansion is thought to be primarily due to highly …
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Power in numbers: quantitative microbial risk assessments of Salmonella in federally sampled ground meat products and the resulting impact of risk management strategies on public health
… years in the US despite a significant Salmonella prevalence reduction in meat and poultry products. The USDA Food Safety and Inspection Service (FSIS) - the agency tasked with ensuring that meat, poultry, and egg products are safe, wholesome, and properly labeled - use qualitative pathogen …
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Ecology and Climate Tolerance of Emerging Tick Disease Vectors in Central Appalachia/Southwestern Virginia
… habitat associations, seasonal phenology, pathogen prevalence, and ecological factors that influences tick presence and abundance. A field study was conducted from June 2019 - November 2020 across 8 counties and 3 habitat types. Forested habitats exhibited greater tick species diversity …
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Factors Associated with Foodborne Pathogens and Fecal Indicator Organisms in Virginia Agricultural Soils
Prior research reveals foodborne pathogens, as well as enteric bacteria, can thrive in agricultural soils. Understanding how macro- and micronutrients, as well as meteorological factors and observational factors, impact pathogen prevalence may promote a better understanding of how pathogens persist …
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INVESTIGATION OF THE MIALOME OF IXODES SCAPULARIS REPLETE TICKS AND UNDERSTANDING THE POPULATION GENOMIC STRUCTURE OF IXODES PACIFICUS TICKS
… ectoparasites that transmit disease-causing pathogens to humans and animals worldwide. Research on vaccine development to protect humans, companion animals, and livestock from ticks and tick-transmitted pathogens has accelerated by using proteomic and transcriptomic analyses. Immunization of …
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Population Genetic Structure of Ixodes pacificus Ticks and Detection of Their Pathogens In-Silico
… and 2) a novel method of detecting tick-borne pathogens in-silico. In Chapter 2, we aimed to understand if I. pacificus, the western black-legged tick, has a population structure and if there is genetic differentiation between tick populations. Using Restriction site Associated DNA sequencing …
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Examining perceived pathogen threat and body weight preferences using experimental priming
… such as disease and the potential existence of pathogens. Furthermore, research has indicated that individuals have a behavioural immune system that causes them to become more vigilant in pathogen heavy environments and implicitly change their behaviour accordingly. However, no research has …
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Influence of natural and anthropogenic factors on Water, Sanitation, and Hygiene (WaSH)
… water microbiome and human exposure to water pathogens. Furthermore, programs like WaSH intervention targeted to change the hygiene behavior of individuals, potentially change the water microbiome but the current knowledge is not adequate to validate it. Thus, the overarching goal of this …
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Abiotic and biotic determinants of tick-borne disease risk in Central Panama
… into the underlying mechanisms of tick and pathogen distributions becomes increasingly urgent. Hard ticks are ectoparasites that typically feed on a vertebrate host once during each of three life stages and transmit pathogens of public health, conservation, and agricultural importance. Tick …
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Characterizing the epidemiology of ophidiomycosis in North American snakes through field studies, modeling, pathogen genomic analysis, and treatment trials
… areas impacted by the disease, how disease and pathogen prevalence vary based on host and environmental factors, the impact of O. ophidiicola genomic diversity on disease epidemiology, and the effectiveness of specific treatment options. The specific objectives were to use fieldwork, clinical …
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The impact of UV radiation on the health and pathogen development of the Pacific oyster (Crassostrea gigas)
… by high water temperatures and the presence of pathogens, particularly Ostreid herpesvirus-1 and variants (OsHV-1 Var) and bacteria of the genus Vibrio such as V. aestuarianus. UV radiation (UVR) is an intertidal stressor which functions as an ecosystem regulator. UVR has disinfectant …