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An Analysis of Antibiotic Resistance in Coastal Environments and Monitoring Frameworks Used for Surveillance
An Analysis of Antibiotic Resistance in Coastal Environments and Monitoring Frameworks Used for Surveillance
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104653
- ISBN
- 9798280782105
- DDC
- 628
- 저자명
- Jimenez, Karina.
- 서명/저자
- An Analysis of Antibiotic Resistance in Coastal Environments and Monitoring Frameworks Used for Surveillance
- 발행사항
- [Sl] : University of California, Los Angeles, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 179 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
- 주기사항
- Advisor: Jay, Jennifer Ayla.
- 학위논문주기
- Thesis (Ph.D. C.E.)--University of California, Los Angeles, 2025.
- 초록/해제
- 요약Antibiotic resistance (AR) is a growing global public health concern, particularly in urbanized coastal environments impacted by urban runoff and inadequate wastewater treatment. This dissertation applies a One Health approach to investigate environmental hotspots for antibiotic-resistant bacteria (ARB) and antibiotic resistance genes (ARGs) in urban coastal areas in the U.S. and Central America using both culture-based and molecular methods.Chapter One presents a study on two Southern California beaches where nasal swabs and health surveys were collected from surfers and non-surfers before, during, and after major rain events. ARB levels, measured using CHROMagar™MRSA, increased after rainfall. Surfers showed significantly higher odds of nasal colonization during wet weather compared to both pre-rain conditions and non-surfing controls.Chapter Two shifts to Central America, where a modified World Health Organization Tricycle Protocol was applied in the lower Belize River watershed and nearby reefs. Using qPCR and metagenomics, ARG concentrations were found to be highest near urban centers and sewage-impacted sites, though ARGs were still detectable in coral reef waters. ESBL-producing E. coli (ESBL-Ec) was only present at sites with elevated ARGs, supporting its use as a potential screening indicator.Chapters Three and Four evaluate the modified IDEXX method in which IDEXX Colilert-18 tests are spiked with Cefotaxime antibiotic to quantify ESBL-Ec in environmental samples. This method was applied to samples from the sewage impacted Tijuana River Estuary and adjacent ocean waters. Results showed strong correlations with traditional culture-based methods (mTEC and TBX agars), supporting its use as a low-barrier alternative for AR monitoring in coastal environments. Chapter Four further validates the method against shotgun metagenomic data, demonstrating consistency in detecting E. coli and ARGs across methods.Together, these studies highlight the need to monitor AR at high-risk coastal environments and support the use of simplified, scalable methods to improve environmental surveillance. The findings in this dissertation have implications for recreational water safety, public health in low-resource settings, and the development of practical tools for AR monitoring in diverse aquatic environments.
- 일반주제명
- Microbiology
- 키워드
- Water quality
- 기타저자
- University of California, Los Angeles Civil and Environmental Engineering 0300
- 기본자료저록
- Dissertations Abstracts International. 86-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798280782105
■035 ▼a(MiAaPQ)AAI32115487
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a628
■1001 ▼aJimenez, Karina.
■24513▼aAn Analysis of Antibiotic Resistance in Coastal Environments and Monitoring Frameworks Used for Surveillance
■260 ▼a[Sl]▼bUniversity of California, Los Angeles▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a179 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-12, Section: B.
■500 ▼aAdvisor: Jay, Jennifer Ayla.
■5021 ▼aThesis (Ph.D. C.E.)--University of California, Los Angeles, 2025.
■520 ▼aAntibiotic resistance (AR) is a growing global public health concern, particularly in urbanized coastal environments impacted by urban runoff and inadequate wastewater treatment. This dissertation applies a One Health approach to investigate environmental hotspots for antibiotic-resistant bacteria (ARB) and antibiotic resistance genes (ARGs) in urban coastal areas in the U.S. and Central America using both culture-based and molecular methods.Chapter One presents a study on two Southern California beaches where nasal swabs and health surveys were collected from surfers and non-surfers before, during, and after major rain events. ARB levels, measured using CHROMagar™MRSA, increased after rainfall. Surfers showed significantly higher odds of nasal colonization during wet weather compared to both pre-rain conditions and non-surfing controls.Chapter Two shifts to Central America, where a modified World Health Organization Tricycle Protocol was applied in the lower Belize River watershed and nearby reefs. Using qPCR and metagenomics, ARG concentrations were found to be highest near urban centers and sewage-impacted sites, though ARGs were still detectable in coral reef waters. ESBL-producing E. coli (ESBL-Ec) was only present at sites with elevated ARGs, supporting its use as a potential screening indicator.Chapters Three and Four evaluate the modified IDEXX method in which IDEXX Colilert-18 tests are spiked with Cefotaxime antibiotic to quantify ESBL-Ec in environmental samples. This method was applied to samples from the sewage impacted Tijuana River Estuary and adjacent ocean waters. Results showed strong correlations with traditional culture-based methods (mTEC and TBX agars), supporting its use as a low-barrier alternative for AR monitoring in coastal environments. Chapter Four further validates the method against shotgun metagenomic data, demonstrating consistency in detecting E. coli and ARGs across methods.Together, these studies highlight the need to monitor AR at high-risk coastal environments and support the use of simplified, scalable methods to improve environmental surveillance. The findings in this dissertation have implications for recreational water safety, public health in low-resource settings, and the development of practical tools for AR monitoring in diverse aquatic environments.
■590 ▼aSchool code: 0031.
■650 4▼aEnvironmental engineering
■650 4▼aMicrobiology
■653 ▼aAntibiotic resistance
■653 ▼aAntimicrobial resistance
■653 ▼aAntibiotic resistance genes
■653 ▼aESBL-producing E. coli
■653 ▼aWastewater surveillance
■653 ▼aWater quality
■690 ▼a0775
■690 ▼a0543
■690 ▼a0410
■71020▼aUniversity of California, Los Angeles▼bCivil and Environmental Engineering 0300.
■7730 ▼tDissertations Abstracts International▼g86-12B.
■790 ▼a0031
■791 ▼aPh.D. C.E.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358380▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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