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Irrigation waters and pipe-based biofilms as sources for antibiotic-resistant bacteria

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Abstract

The presence of antibiotic-resistant bacteria in environmental surface waters has gained recent attention. Wastewater and drinking water distribution systems are known to disseminate antibiotic-resistant bacteria, with the biofilms that form on the inner-surfaces of the pipeline as a hot spot for proliferation and gene exchange. Pipe-based irrigation systems that utilize surface waters may contribute to the dissemination of antibiotic-resistant bacteria in a similar manner. We conducted irrigation events at a perennial stream on a weekly basis for 1 month, and the concentrations of total heterotrophic bacteria, total coliforms, and fecal coliforms, as well as the concentrations of these bacterial groups that were resistant to ampicillin and tetracycline, were monitored at the intake water. Prior to each of the latter three events, residual pipe water was sampled and 6-in. sections of pipeline (coupons) were detached from the system, and biofilm from the inner-wall was removed and analyzed for total protein content and the above bacteria. Isolates of biofilm-associated bacteria were screened for resistance to a panel of seven antibiotics, representing five antibiotic classes. All of the monitored bacteria grew substantially in the residual water between irrigation events, and the biomass of the biofilm steadily increased from week to week. The percentages of biofilm-associated isolates that were resistant to antibiotics on the panel sometimes increased between events. Multiple-drug resistance was observed for all bacterial groups, most often for fecal coliforms, and the distributions of the numbers of antibiotics that the total coliforms and fecal coliforms were resistant to were subject to change from week to week. Results from this study highlight irrigation waters as a potential source for antibiotic-resistant bacteria, which can subsequently become incorporated into and proliferate within irrigation pipe-based biofilms.

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Author notes

  1. Ryan A. Blaustein

    Present address: Soil and Water Science Department, University of Florida, Gainesville, FL, USA

Authors and Affiliations

  1. USDA-ARS Environmental Microbial and Food Safety Laboratory, Beltsville Agricultural Research Center, 10300 Baltimore Ave. Bldg. 173, Beltsville, MD, 20705, USA

    Ryan A. Blaustein, Daniel R. Shelton, Jo Ann S. Van Kessel, Jeffrey S. Karns, Matthew D. Stocker & Yakov A. Pachepsky

  2. Department of Environmental Science and Technology, University of Maryland, College Park, MD, USA

    Ryan A. Blaustein

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  1. Ryan A. Blaustein
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Correspondence to Yakov A. Pachepsky.

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ESM 1

Table S-1. Probabilities that the multiple-drug resistance histograms for different bacterial groups (ref. Fig. 5) were the same on each irrigation event date. (DOCX 11 kb)

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Blaustein, R.A., Shelton, D.R., Van Kessel, J.A.S. et al. Irrigation waters and pipe-based biofilms as sources for antibiotic-resistant bacteria. Environ Monit Assess 188, 56 (2016). https://doi.org/10.1007/s10661-015-5067-4

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