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Applied and Environmental Microbiology, April 2000, p. 1702-1705, Vol. 66, No. 4
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Chlorine, Chloramine, Chlorine Dioxide, and Ozone Susceptibility of Mycobacterium avium

Robert H. Taylor,1 Joseph O. Falkinham III,1,* Cheryl D. Norton,2 and Mark W. LeChevallier2

Fralin Biotechnology Center, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0346,1 and American Water Works Service Co., Inc., Belleville Laboratory, Belleville, Illinois 622202

Received 20 August 1999/Accepted 13 January 2000

Environmental and patient isolates of Mycobacterium avium were resistant to chlorine, monochloramine, chlorine dioxide, and ozone. For chlorine, the product of the disinfectant concentration (in parts per million) and the time (in minutes) to 99.9% inactivation for five M. avium strains ranged from 51 to 204. Chlorine susceptibility of cells was the same in washed cultures containing aggregates and in reduced aggregate fractions lacking aggregates. Cells of the more slowly growing strains were more resistant to chlorine than were cells of the more rapidly growing strains. Water-grown cells were 10-fold more resistant than medium-grown cells. Disinfectant resistance may be one factor promoting the persistence of M. avium in drinking water.


* Corresponding author. Mailing address: Fralin Biotechnology Center, Virginia Tech, Blacksburg, VA 24061-0346. Phone: (540) 231-5931. Fax: (540) 231-7126. E-mail: jofiii{at}vt.edu.


Applied and Environmental Microbiology, April 2000, p. 1702-1705, Vol. 66, No. 4
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.



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