Abstract
Antibiotic resistance is considered to be one of the most significant public health concerns of the twenty-first century. Although traditionally the propagation of antibiotic resistance was considered to be limited to hospitals and other clinical environments, there is a growing realization that it is also associated with anthropogenically impacted environmental reservoirs. Wastewater treatment plants are considered to be significant reservoirs of antibiotic resistance because they combine extremely high levels of fecal- and environmental-derived bacteria with residual concentrations of antibiotic compounds believed to induce selection. These bacteria are primarily congregated in dense biofilms that are “hot spots” for horizontal gene transfer, which can facilitate inter- and intraspecies transfer of antibiotic genes, potentially resulting in the development of multidrug-resistant strains. Several studies have demonstrated that although wastewater treatment plants significantly reduce bacterial concentrations, relatively high levels of antibiotic-resistant bacteria and resistance genes are still present in effluents released to aquatic and soil environments and that under certain circumstances these resistance elements may persist for long periods of time in downstream environments. These elements may have significant epidemiological ramifications, especially when effluents enter drinking water and food webs; and henceforth, antibiotic resistance genes have recently been characterized as contaminants of emerging concern. This chapter summarizes current understanding of antibiotic resistance in wastewater treatment plants and downstream environments, presents knowledge gaps that need to be bridged in order to better understand the potential ramifications of this phenomenon, overviews the effect of disinfection treatments on antibiotic resistance elements, and finally discusses policy guidelines that should be implemented in the future to reduce the risks of antibiotic resistance from wastewater treatment plants.
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Abbreviations
- AR:
-
Antibiotic resistance
- ARB:
-
Antibiotic-resistant bacteria
- ARGs:
-
Antibiotic resistance genes
- BHR:
-
Broad host range
- CFU:
-
Colony-forming units
- CIs:
-
Chromosomal integrons
- E-COFF:
-
Epidemiological cutoff
- ERIC:
-
Enterobacterial repetitive intergenic consensus
- ESBL:
-
Extended spectrum beta-lactamase
- GC:
-
Gene cassettes
- GFP:
-
Green fluorescent protein
- HGT:
-
Horizontal gene transfer
- IS:
-
Insertion sequences
- ISCR:
-
Insertion sequence common regions
- MAR:
-
Multiple antibiotic resistance
- MDR:
-
Multiple drug resistance
- MGEs:
-
Mobile genetic elements
- MIC:
-
Minimal inhibitory concentration
- MIs:
-
Mobile integrons
- MLST:
-
Multilocus sequence typing
- MRIs:
-
Multidrug-resistant integrons
- NGS:
-
Next-generation sequencing
- Pc:
-
Promoter
- PCR:
-
Polymerase chain reaction
- qPCR:
-
Quantitative polymerase chain reaction
- RIs:
-
Resistant integrons
- TRACA:
-
Transposon-aided capture
- UV:
-
Ultraviolet
- VRE:
-
Vancomycin-resistant Enterococcus faecium
- WW:
-
Wastewater
- WWTPs:
-
Wastewater treatment plants
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Gatica, J., Kaplan, E., Cytryn, E. (2015). Antibiotic Resistance Elements in Wastewater Treatment Plants: Scope and Potential Impacts. In: Fatta-Kassinos, D., Dionysiou, D., Kümmerer, K. (eds) Wastewater Reuse and Current Challenges . The Handbook of Environmental Chemistry, vol 44. Springer, Cham. https://doi.org/10.1007/698_2015_361
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