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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 Use...
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  
Environmental engineering
일반주제명  
Microbiology
키워드  
Antibiotic resistance
키워드  
Antimicrobial resistance
키워드  
Antibiotic resistance genes
키워드  
ESBL-producing E. coli
키워드  
Wastewater surveillance
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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■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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