Impacts of urbanization on the prevalence of antibiotic-resistant Escherichia coli in the Chaophraya River and its tributaries

River water samples were taken from 32 locations around the basin of Chaophraya River and its four major tributaries in Thailand to investigate resistance ratios of Escherichia coli isolates to eight antibiotic agents of amoxicillin, sulfamethoxazole/trimethoprim, tetracycline, doxytetracycline, cip...

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Veröffentlicht in:Water science and technology 2016-01, Vol.73 (2), p.362-374
Hauptverfasser: Honda, Ryo, Watanabe, Toru, Sawaittayotin, Variga, Masago, Yoshifumi, Chulasak, Rungnapa, Tanong, Kulchaya, Chaminda, G Tushara, Wongsila, Krison, Sienglum, Chawala, Sunthonwatthanaphong, Varisara, Poonnotok, Anupong, Chiemchaisri, Wilai, Chiemchaisri, Chart, Furumai, Hiroaki, Yamamoto, Kazuo
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container_end_page 374
container_issue 2
container_start_page 362
container_title Water science and technology
container_volume 73
creator Honda, Ryo
Watanabe, Toru
Sawaittayotin, Variga
Masago, Yoshifumi
Chulasak, Rungnapa
Tanong, Kulchaya
Chaminda, G Tushara
Wongsila, Krison
Sienglum, Chawala
Sunthonwatthanaphong, Varisara
Poonnotok, Anupong
Chiemchaisri, Wilai
Chiemchaisri, Chart
Furumai, Hiroaki
Yamamoto, Kazuo
description River water samples were taken from 32 locations around the basin of Chaophraya River and its four major tributaries in Thailand to investigate resistance ratios of Escherichia coli isolates to eight antibiotic agents of amoxicillin, sulfamethoxazole/trimethoprim, tetracycline, doxytetracycline, ciprofloxacin, levofloxacin, norfloxacin and ofloxacin. Principal component analysis was performed to characterize resistance patterns of the samples. Relevancy of the obtained principal components with urban land use and fecal contamination of the river were examined. The ratio of antibiotic-resistant bacteria is likely to increase when urban land use near the sampling site exceeds a certain ratio. The resistance ratio to fluoroquinolones tends to be high in a highly populated area. Meanwhile, no significant contribution of fecal contamination was found to increase the resistance ratio. These results suggest that an antibiotic-resistance ratio is dependent on conditions of local urbanization rather than the upstream conditions, and that the major sources of antibiotic-resistant bacteria in the Chaophraya River basin are possibly point sources located in the urban area which contains a high ratio of resistant bacteria.
doi_str_mv 10.2166/wst.2015.502
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Principal component analysis was performed to characterize resistance patterns of the samples. Relevancy of the obtained principal components with urban land use and fecal contamination of the river were examined. The ratio of antibiotic-resistant bacteria is likely to increase when urban land use near the sampling site exceeds a certain ratio. The resistance ratio to fluoroquinolones tends to be high in a highly populated area. Meanwhile, no significant contribution of fecal contamination was found to increase the resistance ratio. 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subjects Amoxicillin
Anti-Bacterial Agents
Antibiotic resistance
Antibiotics
Bacteria
Canals
Ciprofloxacin
Contamination
Developing countries
Drug resistance
Drug Resistance, Bacterial
Drug Resistance, Microbial
E coli
Escherichia coli
Escherichia coli - isolation & purification
Escherichia coli - physiology
Fecal coliforms
Fluoroquinolones
Freshwater
Land pollution
Land use
LDCs
Levofloxacin
Microbial Sensitivity Tests
Norfloxacin
Ofloxacin
Point sources
Principal components analysis
Ratios
River basins
River water
Rivers
Rivers - microbiology
Studies
Sulfamethoxazole
Tetracycline
Thailand
Tributaries
Trimethoprim
Urban areas
Urbanization
Water analysis
Water Microbiology
Water sampling
title Impacts of urbanization on the prevalence of antibiotic-resistant Escherichia coli in the Chaophraya River and its tributaries
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