Are ESBL-producing E. coli isolated from a WWTP effluent more resistant to UV light at different wavelengths?

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Conference Proceeding

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ESBL-producing E. coli, UV-LEDs, Microbial Selectivity


Global integrated surveillance of the dissemination of extended spectrum β-lactamase-producing E. coli using “One Health” approach is proposed by World Health Organisation. To minimize microbial spread in the environment, conventional, mercury-vapour, UV lamps are commonly employed to disinfect wastewater effluents after traditional treatment processes. Since their disposal is a significant environmental issue, UV-LEDs, are emerging as a sustainable alternative. In this work, we aimed to address certain contradictions about selective microbial responses to UV disinfection. We have investigated UV susceptibility of three ESBL-producing E. coli strains, with different DNA characteristics, and a type-strain (ATCC 25922) upon disinfection with UV-LEDs at 3 different wavelengths (265, 285 and 300 nm). Our current results suggest that, when bacteria are exposed to sublethal doses of UV light, selection of clinically relevant, antibiotic resistant bacteria may occur, resulting in an increased proportion of ESBL-producers in the population released after the treatment.

Source Publication

11th Micropol & Ecohazard Conference, 20-24Oct 2019, Seoul, South Korea

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Publisher Statement

The International Water Association

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