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Prevalence of antibiotic resistance in drinking water treatment and distribution systems.

Authors
  • Xi, Chuanwu
  • Zhang, Yongli
  • Marrs, Carl F
  • Ye, Wen
  • Simon, Carl
  • Foxman, Betsy
  • Nriagu, Jerome
Type
Published Article
Journal
Applied and Environmental Microbiology
Publisher
American Society for Microbiology
Publication Date
Sep 01, 2009
Volume
75
Issue
17
Pages
5714–5718
Identifiers
DOI: 10.1128/AEM.00382-09
PMID: 19581476
Source
Medline
License
Unknown

Abstract

The occurrence and spread of antibiotic-resistant bacteria (ARB) are pressing public health problems worldwide, and aquatic ecosystems are a recognized reservoir for ARB. We used culture-dependent methods and quantitative molecular techniques to detect and quantify ARB and antibiotic resistance genes (ARGs) in source waters, drinking water treatment plants, and tap water from several cities in Michigan and Ohio. We found ARGs and heterotrophic ARB in all finished water and tap water tested, although the amounts were small. The quantities of most ARGs were greater in tap water than in finished water and source water. In general, the levels of bacteria were higher in source water than in tap water, and the levels of ARB were higher in tap water than in finished water, indicating that there was regrowth of bacteria in drinking water distribution systems. Elevated resistance to some antibiotics was observed during water treatment and in tap water. Water treatment might increase the antibiotic resistance of surviving bacteria, and water distribution systems may serve as an important reservoir for the spread of antibiotic resistance to opportunistic pathogens.

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