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 “"quantitative microbial risk assessment"”.
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Application of Quantitative Microbial Risk Assessment to Domestic Hygiene
… manage waste greatly reduces the public health risk of pathogen spread. The domestic restroom, more specifically the modern-day toilet is both a source and a sink for much of our residual wastewaters. With the onset and resurgence of the COVID-19 pandemic, domestic hygiene has recently become …
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Developing sampling simulation and quantitative microbial risk assessment to improve food safety management systems
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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Quantitative Microbial Risk Assessment Model to Estimate Exposure to Campylobacter from Consumption of Chicken in the United States
… persistence in chicken prior to consumption a quantitative microbial risk assessment (QMRA) was conducted for boneless, skinless chicken breast meals prepared and consumed domestically in the contiguous United States. This QMRA model was developed with @RISK software (Palisade Corp., Ithaca, …
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Risk Analysis Based on Performance Criteria: A Food Safety Control System and Decision-making Tool to Control Salmonella from Whole Broilers
Risk analysis is a powerful science-based tool that can be used to control and mitigate microbial food safety hazards. Codex recommends conducting preliminary risk management activities (PRMAs) to initiate risk analysis and to plan the risk assessment process. The information learned from these …
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Impact of strain variability on the risk presented to chilled foods by non-proteolytic clostridium botulinum
This PhD thesis aims to extend the current quantitative microbial risk assessment for minimally heated chilled foods by including information on variability of non-proteolytic Clostridium botulinum at strain level. The research on strain variability covers practical experiments as well as …
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Development of a Risk Assessment Model to Assess TMDL Implementation Strategies
… each. Although past research indicates that the risk of illness to humans varies by source of fecal contamination, current watershed assessments are developed according to total concentration of indicator bacteria, with all sources weighed equally. A stochastic model using Quantitative Microbial …
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Meta-Analysis on the Effect of Interventions Used in Cattle Processing Plants to Reduce Escherichia coli Contamination in Beef
A Quantitative Microbial Risk Assessment (QMRA) has been undertaken to utilize research on Shiga-toxin Escherichia coli (STEC) contamination in beef for the benefit of public health. The QMRA operates as a 2nd order Monte Carlo simulation to create stochastic mathematical models that incorporate …
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Desenvolvimento de modelos de avaliação quantitativa de risco microbiológico associados a Toxina estafilocócica e a Listeria monocytogenes em produtos lácteos
A avaliação quantitativa de risco microbiológico (Quantitative Microbial Risk Assessment; QMRA) é a etapa mais complexa da análise de risco, que permite que todos os envolvidos na cadeia produtiva de alimentos, desde órgãos reguladores até a indústria, obtenham informações numéricas concretas a …
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Dishwashing Water Recycling System and Related Water Quality Standards for Military Use
… and ultrafiltration process. A quantitative microbial risk assessment (QMRA) was also performed based on exposure scenarios derived from literature data. As a result, a specific set of dishwashing water reuse standards for field analysis (simple, but accurate) was finalized as …
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Quantitative sustainable design of water and sanitation infrastructure in resource-rich and resource-limited contexts
Quantitative sustainable design, a process of mechanistically linking design and operational decisions to sustainability indicators, can inform decision-making for water and sanitation infrastructure by enabling navigation of trade-offs across dimensions of sustainability (e.g., environmental, …
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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
… on pathogen presence or absence. However, novel quantitative Salmonella enumeration methods are emerging with advances in food sampling technologies resulting in more timely, less costly pathogen characterization. Pathogen enumeration allows risk assessors to use dose-response relationships to …
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Novel Approaches to Exposure Assessment and Dose Response to Contaminants in Drinking Water and Food
… health. Thus, this dissertation focuses on risk assessment and applying novel methods for exposure assessments and dose responses to contaminants in drinking water and foods. Factors that greatly impact contaminant exposures and human dose response include: population susceptibility (i.e., …
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Impact of a Barrier on Transport of Particles and Aerosolization of Viruses at a Wastewater Treatment Plant
… SARS-CoV-2 concentrations at the WWTP. A quantitative microbial risk assessment model was constructed to determine inhalation risks associated with airborne SARS-CoV-2 for WWTP operators. The probability of infection ranged from about 2.4 x 10-4 to 5.6 x 10-8 and was heavily dependent on …
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Influence of natural and anthropogenic factors on Water, Sanitation, and Hygiene (WaSH)
… floods, and landslides. To reduce the risk of diarrheal diseases, it is essential to understand the impact of natural disasters on water microbiome and human behavior. It is also vital to understand the interaction between water microbiome and human exposure to water pathogens. …
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Risk Assessment tool for water reuse - University of Cape Town as a case study
… alternative sources effectively, the associated risks must be understood. The World Health Organisation's Quantitative Microbial Risk Assessment (QMRA) already exists but can be complex, and relevant pathogen data is limited in South Africa. The existing risk assessment framework for irrigation …
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Disinfection of wastewater for reuse using microchannel plasma ozone generator
… initial WOM loading. An integrated life cycle assessment (LCA) and quantitative microbial risk assessment (QMRA) was used to compare microplasma ozonation versus chlorination to disinfect wastewater for landscape irrigational reuse. L. pneumophila, Giardia, and Cryptosporidium parvum were …
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Assessment of health risk association with groundwater from Collins Chabane and Makhado Municipality of Vhembe District
… vulnerability to Physico-chemical and microbial contamination across the Collins Chabane and Makhado Municipality. A three-set of samples (for metals, non-metals and microbial analysis) were randomly collected from twenty (20) primary schools, fifteen (15) private boreholes, and three …
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Modeling risks associated with water reuse in agriculture
… of the sprayed water. Chapter 3 modeled the risks from ammonia toxicity, as well as infection with non-tuberculosis Mycobacteria (NTM) and Legionella pneumophila, with the intention of determining whether it is safer to anaerobically digest and disinfect wastewater prior to irrigation or to …
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Disinfection of fresh produce contaminated by enteric viruses and their inactivation mechanisms
… to crops, resulting in foodborne infection risks, especially for fresh produce eaten raw. Upon harvest, vegetables are commonly washed by a sanitizer to inactivate viruses that may cause foodborne infections. Despite this sanitation step, foodborne viral outbreaks associated with fresh …
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Rooftop Collected Rainwater Quality and Vegetation Impact: Field Work in Lagos, Nigeria, and the Related Experimental and Numerical Studies
… This study used QMRA to evaluate the health risk associated with bacterial contamination of roof-harvested rainwater (RHRW). To achieve this, the impact of some improvement techniques (such as first flush, sedimentation, and Household Treatment Techniques (HHTTs)) on the quality of rainwater …