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Wastewater-Based and Environmental Surveillance of Infectious Diseases and Antimicrobial Resistance.
Wastewater-Based and Environmental Surveillance of Infectious Diseases and Antimicrobial Resistance.
상세정보
- 자료유형
- 학위논문(국외)
- 기본표목-개인명
- 표제와 책임표시사항
- Wastewater-Based and Environmental Surveillance of Infectious Diseases and Antimicrobial Resistance.
- 발행, 배포, 간사 사항
- 발행, 배포, 간사 사항
- 형태사항
- 164 p.
- 일반주기
- Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
- 일반주기
- Advisor: Dvonch, Joseph Tim;Xi, Chuanwu.
- 학위논문주기
- Thesis (Ph.D.)--University of Michigan, 2025.
- 요약 등 주기
- 요약Wastewater-based epidemiology (WBE) offers a powerful, non-invasive approach to monitor public health at the community level, especially in detecting infectious diseases and antimicrobial resistance (AMR). While WBE gained prominence during the COVID-19 pandemic, its broader application across environmental contexts and microbial threats remains underutilized. This dissertation addresses key methodological and knowledge gaps in WBE from multiple dimensions: Aim 1 develops high-throughput molecular tools for virus detection, Aim 2 implements AMR and Acinetobacter surveillance in urban wastewater by integrating multiple monitoring methods, and Aim 3 extends WBE principles and methods to environmental monitoring of surface water.Aim 1 focused on developing two multiplex reverse transcription droplet digital PCR (RT-ddPCR) panels to detect respiratory and enteric viruses (Influenza A/B, SARS-CoV-2, Norovirus GI/GII, RSV) in wastewater. The selected viruses represent major pathogens of public health concern that are frequently associated with community outbreaks and have been widely studied in wastewater-based surveillance. These multiplex RT-ddPCR panels were designed using the six-color QX600™ ddPCR system and validated using synthetic RNA and spiked wastewater samples. The multiplex assays demonstrated high specificity, sensitivity (LoD 0.25-0.75 copies/µL), and strong concordance with singleplex assays (R² 0.94, Kendall's τ 0.89), with minimal quantification bias. The results confirmed that multiplex RT-ddPCR offers a robust, efficient, and scalable method for viral surveillance, reducing sample and reagent usage while maintaining high analytical performance.Aim 2 investigated the spatial and temporal dynamics of AMR genes, mobile genetic elements (MGEs), and Acinetobacter spp. across a university wastewater network. Weekly samples were collected over 1.5 years from five locations, including a hospital outlet, residential sewers, and a treatment plant. To profile the microbiome and resistome of wastewater samples, selective culture of Acinetobacter spp., ddPCR for bacteria and AMR genes, and metagenomic sequencing were performed. We identified clear seasonal trends in bacterial abundance and location-specific differences in resistome and mobilome profiles. Acinetobacter spp. abundance correlated strongly with AMR gene load (r 0.7), suggesting that this genus plays a key role in shaping the resistome of urban wastewater. Genome-resolved metagenomics further revealed that dominant Acinetobacter genomes harbored clinically relevant resistance genes, such as blaOXA variants (conferring carbapenem resistance) and adeB/adeIJK (components of efflux pumps associated with multidrug resistance). This indicates that Acinetobacter not only carries a high burden of AMR genes but may also act as a primary reservoir and vehicle for their environmental persistence and potential spread.. Network analysis based on Spearman correlations between bacterial genera and AMR phenotypes identified Acinetobacter as a central hub, showing high degree, strength, and betweenness centrality compared to other genera. This indicates that Acinetobacter was one of the most strongly and broadly connected taxa in terms of co-occurrence with multiple resistance phenotypes, suggesting its prominent role in structuring the resistome within the wastewater system. Source tracking analysis suggested residential-like inputs, not hospital sources, as dominant contributors to the treatment plant influent. These findings demonstrate that wastewater surveillance can reveal hidden drivers of AMR dissemination-such as high-burden community sources-and identify key microbial taxa that contribute to resistance gene mobility. By integrating culture, molecular, and genomic approaches, this work provides a framework for monitoring AMR beyond clinical settings, informing targeted interventions in sewer-shed management, and supporting One Health efforts to mitigate resistance risks at the human-environment interface.Aim 3 applied WBE tools to assess fecal contamination in a recreational inland lake, extending WBE principles beyond centralized systems. Weekly samples during swimming seasons were tested for E. coli using culture and ddPCR (EC23S, AllBac), alongside MST markers for human (HF183) and goose (ND2) fecal sources. Results showed strong correlations between ddPCR and culture methods, with ddPCR offering greater sensitivity and reduced time to results. To identify contamination sources, we used multiple linear regression models, with fecal indicator bacteria (e.g., log-transformed E. coli, EC23S, or AllBac concentrations) as outcomes and MST marker concentrations as predictors. These models consistently identified ND2 (goose-associated) as the dominant predictor of fecal contamination, while HF183 (human-associated) contributions were minimal. While microbiologists have long monitored microbes in water systems, WBE methodologies represent a more integrated, population-level approach that combines quantitative molecular assays (like ddPCR), source attribution through MST markers, and frequent sampling to assess human health risks and contamination patterns in real time. In this study, WBE principles were adapted to a non-sewered setting by applying these molecular and statistical tools to track fecal pollution sources across space and time. These findings support targeted risk mitigation efforts-such as bird population management at recreational beaches-and demonstrate the broader adaptability of WBE frameworks for environmental surveillance in natural waters.Overall, this dissertation advances WBE by establishing and validating scalable, multi-target molecular tools and demonstrating their application across clinical, community, and recreational environments. By integrating ddPCR, metagenomics, and microbial source tracking, this research provides a holistic framework for monitoring pathogens, resistance genes, and fecal contamination. The findings have broad implications for environmental surveillance, public health protection, and One Health policy development, emphasizing the value of wastewater and environmental microbiology in addressing complex health threats at the human-environment interface.
- 주제명부출표목-일반주제명
- 주제명부출표목-일반주제명
- 주제명부출표목-일반주제명
- 비통제 색인어
- 비통제 색인어
- 비통제 색인어
- 비통제 색인어
- 부출표목-단체명
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 원문정보보기
MARC
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■1001 ▼aLi, Xin.
■24510▼aWastewater-Based and Environmental Surveillance of Infectious Diseases and Antimicrobial Resistance.
■260 ▼a[S.l.]▼bUniversity of Michigan. ▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a164 p.
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-03, Section: B.
■500 ▼aAdvisor: Dvonch, Joseph Tim;Xi, Chuanwu.
■5021 ▼aThesis (Ph.D.)--University of Michigan, 2025.
■520 ▼aWastewater-based epidemiology (WBE) offers a powerful, non-invasive approach to monitor public health at the community level, especially in detecting infectious diseases and antimicrobial resistance (AMR). While WBE gained prominence during the COVID-19 pandemic, its broader application across environmental contexts and microbial threats remains underutilized. This dissertation addresses key methodological and knowledge gaps in WBE from multiple dimensions: Aim 1 develops high-throughput molecular tools for virus detection, Aim 2 implements AMR and Acinetobacter surveillance in urban wastewater by integrating multiple monitoring methods, and Aim 3 extends WBE principles and methods to environmental monitoring of surface water.Aim 1 focused on developing two multiplex reverse transcription droplet digital PCR (RT-ddPCR) panels to detect respiratory and enteric viruses (Influenza A/B, SARS-CoV-2, Norovirus GI/GII, RSV) in wastewater. The selected viruses represent major pathogens of public health concern that are frequently associated with community outbreaks and have been widely studied in wastewater-based surveillance. These multiplex RT-ddPCR panels were designed using the six-color QX600™ ddPCR system and validated using synthetic RNA and spiked wastewater samples. The multiplex assays demonstrated high specificity, sensitivity (LoD 0.25-0.75 copies/µL), and strong concordance with singleplex assays (R² 0.94, Kendall's τ 0.89), with minimal quantification bias. The results confirmed that multiplex RT-ddPCR offers a robust, efficient, and scalable method for viral surveillance, reducing sample and reagent usage while maintaining high analytical performance.Aim 2 investigated the spatial and temporal dynamics of AMR genes, mobile genetic elements (MGEs), and Acinetobacter spp. across a university wastewater network. Weekly samples were collected over 1.5 years from five locations, including a hospital outlet, residential sewers, and a treatment plant. To profile the microbiome and resistome of wastewater samples, selective culture of Acinetobacter spp., ddPCR for bacteria and AMR genes, and metagenomic sequencing were performed. We identified clear seasonal trends in bacterial abundance and location-specific differences in resistome and mobilome profiles. Acinetobacter spp. abundance correlated strongly with AMR gene load (r 0.7), suggesting that this genus plays a key role in shaping the resistome of urban wastewater. Genome-resolved metagenomics further revealed that dominant Acinetobacter genomes harbored clinically relevant resistance genes, such as blaOXA variants (conferring carbapenem resistance) and adeB/adeIJK (components of efflux pumps associated with multidrug resistance). This indicates that Acinetobacter not only carries a high burden of AMR genes but may also act as a primary reservoir and vehicle for their environmental persistence and potential spread.. Network analysis based on Spearman correlations between bacterial genera and AMR phenotypes identified Acinetobacter as a central hub, showing high degree, strength, and betweenness centrality compared to other genera. This indicates that Acinetobacter was one of the most strongly and broadly connected taxa in terms of co-occurrence with multiple resistance phenotypes, suggesting its prominent role in structuring the resistome within the wastewater system. Source tracking analysis suggested residential-like inputs, not hospital sources, as dominant contributors to the treatment plant influent. These findings demonstrate that wastewater surveillance can reveal hidden drivers of AMR dissemination-such as high-burden community sources-and identify key microbial taxa that contribute to resistance gene mobility. By integrating culture, molecular, and genomic approaches, this work provides a framework for monitoring AMR beyond clinical settings, informing targeted interventions in sewer-shed management, and supporting One Health efforts to mitigate resistance risks at the human-environment interface.Aim 3 applied WBE tools to assess fecal contamination in a recreational inland lake, extending WBE principles beyond centralized systems. Weekly samples during swimming seasons were tested for E. coli using culture and ddPCR (EC23S, AllBac), alongside MST markers for human (HF183) and goose (ND2) fecal sources. Results showed strong correlations between ddPCR and culture methods, with ddPCR offering greater sensitivity and reduced time to results. To identify contamination sources, we used multiple linear regression models, with fecal indicator bacteria (e.g., log-transformed E. coli, EC23S, or AllBac concentrations) as outcomes and MST marker concentrations as predictors. These models consistently identified ND2 (goose-associated) as the dominant predictor of fecal contamination, while HF183 (human-associated) contributions were minimal. While microbiologists have long monitored microbes in water systems, WBE methodologies represent a more integrated, population-level approach that combines quantitative molecular assays (like ddPCR), source attribution through MST markers, and frequent sampling to assess human health risks and contamination patterns in real time. In this study, WBE principles were adapted to a non-sewered setting by applying these molecular and statistical tools to track fecal pollution sources across space and time. These findings support targeted risk mitigation efforts-such as bird population management at recreational beaches-and demonstrate the broader adaptability of WBE frameworks for environmental surveillance in natural waters.Overall, this dissertation advances WBE by establishing and validating scalable, multi-target molecular tools and demonstrating their application across clinical, community, and recreational environments. By integrating ddPCR, metagenomics, and microbial source tracking, this research provides a holistic framework for monitoring pathogens, resistance genes, and fecal contamination. The findings have broad implications for environmental surveillance, public health protection, and One Health policy development, emphasizing the value of wastewater and environmental microbiology in addressing complex health threats at the human-environment interface.
■590 ▼aSchool code: 0127.
■650 4▼aPublic health.
■650 4▼aEnvironmental health.
■650 4▼aEnvironmental science.
■653 ▼aWastewater-based epidemiology
■653 ▼aAntimicrobial resistance
■653 ▼aMicrobial source tracking
■653 ▼aCOVID-19
■690 ▼a0470
■690 ▼a0573
■690 ▼a0768
■71020▼aUniversity of Michigan▼bEnvironmental Health Sciences.
■7730 ▼tDissertations Abstracts International▼g87-03B.
■790 ▼a0127
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359872▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


