Annual changes in the occurrence of antibiotic-resistant coliform bacteria and enterococci in municipal wastewater
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Wastewater contains subinhibitory concentrations of different micropollutants such as antibiotics that create selective pressure on bacteria. This phenomenon is also caused by insufficient wastewater treatment technology leading to the development and spread of antibiotic-resistant bacteria and resistance genes into the environment. Therefore, this work focused on monitoring of antibiotic-resistant coliform bacteria and enterococci in influent and effluent wastewaters taken from the second biggest wastewater treatment plant (Petržalka) in the capital of Slovakia during 1 year. Antibiotic-resistant strains were isolated, identified, and characterized in terms of susceptibility and biofilm production. All of 27 antibiotic-resistant isolates were identified mainly as Morganella morganii, Citrobacter spp., and E. coli. Multidrug-resistance was detected in 58% of isolated strains. All tested isolates could form biofilm; two strains were very strong producers, and 74% formed biofilm by strong intensity. The flow rate of the influent wastewater had a more significant impact on the number of studied bacteria than the temperature.
KeywordsE. coli Coliform bacteria Wastewater treatment plant Multidrug-resistance Biofilm MALDI-TOF MS
This work was financially supported by the Scientific Grant Agency VEGA (Grant number VEGA 1/0096/17), by the Slovak Research and Development Agency (Grant number APVV-16-0171) and by a project for the building of infrastructure for the modern research of civilization diseases (ITMS 26230120006).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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