Inactivation of environmental mycobacteria by free chlorine and UV

Water Research
Eun-Sook LeeJong-Ok Ka

Abstract

The resistance of environmental mycobacteria (EM) against chlorine and ultraviolet (UV) was evaluated for determination of the Ct value and UV dose to inactivate EM. Chlorine disinfection experiments were done on Mycobacterium fortuitum in oxidant demand-free buffered water at the worst condition (pH 8.5, 4 degrees C) and normal condition (pH 7.0, 20 degrees C). The Ct value for 3log inactivation of M. fortuitum was 600 times greater than that of Escherichia coli. UV experiments were performed for various species of Mycobacterium avium, M. fortuitum, Mycobacterium intracellulare, and Mycobacterium lentiflavum. A UV collimated beam device was used for irradiation of four species suspended in phosphate buffered saline with doses of 5, 10, 20, 50, and 100mJ/cm(2). UV sensitivity of mycobacteria was species-specific. More than 3log of M. avium, M. intracellulare, and M. lentiflavum could be inactivated at 20mJ/cm(2), whereas M. fortuitum was so resistant that 3log inactivation required a dose of more than 50mJ/cm(2). Mycobacteria were found 2-10 times more resistant to UV than E. coli for 3log inactivation. There was no significant difference in the inactivation of mycobacteria with either low-pressure or medium-pressure UV irradia...Continue Reading

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Citations

Oct 19, 2013·International Journal of Food Microbiology·Sam Van HauteImca Sampers
Apr 5, 2012·Journal of Applied Microbiology·H WhileyR Bentham
Aug 22, 2013·Environmental Science & Technology·Hong WangAmy Pruden
Nov 21, 2012·Water Research·V J PereiraM T Barreto Crespo
Nov 19, 2015·International Journal of Environmental Research and Public Health·Lisa M Casanova, Mark D Sobsey
Aug 5, 2017·International Journal of Mycobacteriology·E A Roshani EdirisingheAppudurai Arulkanthan
Jul 18, 2019·Environmental Technology·Michelle Fernanda BrugneraMaria Valnice Boldrin Zanoni
Jun 10, 2020·Scientific Reports·E PfrommerT Gutsmann
Oct 27, 2020·SAGE Open Medicine·Thomas W HuberChetan Jinadatha
Mar 2, 2021·The Science of the Total Environment·Takashi Azuma, Tetsuya Hayashi
Aug 22, 2021·International Journal of Food Microbiology·Mohammadreza Dehghan AbnaviParthasarathy Srinivasan

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