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Applied and Environmental Microbiology, April 2000, p. 1702-1705, Vol. 66, No. 4
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.
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
*
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.
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