Analysis of Bacterial Communities Resistant to Ciprofloxacin and Tetracycline in Municipal Activated Sludge

  • MIURA Itsumi
    Department of Bioenvironment, Graduate School of Agricultural Sciences, Yamagata University
  • NISHIYAMA Masateru
    Department of Food, Life and Environmental Sciences, Faculty of Agriculture, Yamagata University
  • PU Jian
    Faculty of Information Networking for Innovation and Design, Toyo University
  • PRAYOGA Windra
    Faculty of Food Technology, Gadja Mada University
  • CHIEMCHAISRI Chart
    Department of Environmental Engineering, Faculty of Engineering, Kasetsart University
  • CHIEMCHAISRI Wilai
    Department of Environmental Engineering, Faculty of Engineering, Kasetsart University
  • WATANABE Toru
    Department of Food, Life and Environmental Sciences, Faculty of Agriculture, Yamagata University

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Other Title
  • 活性汚泥に存在するシプロフロキサシンとテトラサイクリンに耐性を示す細菌群集の探索
  • カッセイ オデイ ニ ソンザイ スル シプロフロキサシン ト テトラサイクリン ニ タイセイ オ シメス サイキン グンシュウ ノ タンサク

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Abstract

<p>Wastewater treatment plants are considered to be reservoirs of antibiotic-resistant bacteria (ARB) outside human and animal bodies. To collect the supporting data, we investigated the existence of ARB in the activated sludge process of municipal wastewater treatment by analyzing communities of sludge bacteria that were incubated with high concentrations of antibiotics (ciprofloxacin or tetracycline) , using the next-generation sequencing technique targeting the 16S rRNA gene. Activated sludge samples were taken from aeration tanks at five municipal wastewater treatment plants (MWWTPs) and one university wastewater treatment plant in Thailand and Japan. Bacterial communities in the sludge samples before incubation were similar among the four MWWTPs in Thailand, but obviously different from those in Japan. The composition of sludge bacteria was markedly changed upon incubation. The concentrations of Enterobacteriaceae species in the sludge samples from two MWWTPs in Thailand increased to 71.3 and 81.4% during incubation with ciprofloxacin, indicating high resistance to this antibiotic. No such increases of specific bacteria families were observed during incubation of the sludge samples with tetracycline, but seven of the top ten dominant families of bacteria were common among the samples from three MWWTPs in Thailand, probably owing to the wide range of sludge bacteria resistant to tetracycline.</p>

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