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Antimicrobial Agents and Chemotherapy, November 1999, p. 2600-2606, Vol. 43, No. 11
0066-4804/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Drug Tolerance in Mycobacterium tuberculosis

Robert S. Wallis,1,* Shripad Patil,2 Seon-Hee Cheon,1,3 Kay Edmonds,1 Manijeh Phillips,1 Mark D. Perkins,4,5,dagger Moses Joloba,6 Alice Namale,6 John L. Johnson,1 Lucileia Teixeira,4 Reynaldo Dietze,4 Salman Siddiqi,7 Roy D. Mugerwa,6 Kathleen Eisenach,8 and Jerrold J. Ellner1

Case Western Reserve University, Cleveland Ohio1; National Institute of Mental Health and Neuroscience, Bangalore, India2; Ewha Womans University Hospital, Seoul, Republic of Korea3; Federal do Espírito Santo, Vitória, Brazil4; Duke University Medical Center, Durham, North Carolina5; Makerere University, Kampala, Uganda6; Becton Dickinson, Sparks, Maryland7; and University of Arkansas Medical Center, Little Rock, Arkansas8

Received 1 June 1999/Returned for modification 3 August 1999/Accepted 13 August 1999

Although Mycobacterium tuberculosis is eradicated rapidly during therapy in some patients with pulmonary tuberculosis, it can persist for many months in others. This study examined the relationship between mycobacterial drug tolerance (delayed killing in vitro), persistence, and relapse. It was performed with 39 fully drug-susceptible isolates from a prospective trial of standard short-course antituberculous therapy with sputum smear-positive, human immunodeficiency virus-uninfected subjects with pulmonary tuberculosis in Brazil and Uganda. The rate of killing in vitro was determined by monitoring the growth index (GI) in BACTEC 12B medium after addition of drug to established cultures and was measured as the number of days required for 99% sterilization. Drugs differed significantly in bactericidal activity, in the following order from greatest to least, rifampin > isoniazid-ethambutol > ethambutol (P < 0.001). Isolates from subjects who had relapses (n = 2) or in whom persistence was prolonged (n = 1) were significantly more tolerant of isoniazid-ethambutol and rifampin than isolates from other subjects (P < 0.01). More generally, the duration of persistence during therapy was predicted by strain tolerance to isoniazid and rifampin (P = 0.012 and 0.026, respectively). Tolerance to isoniazid-ethambutol and tolerance to rifampin were highly correlated (P < 0.001). Tolerant isolates did not differ from others with respect to the MIC of isoniazid; the rate of killing of a tolerant isolate by isoniazid-ethambutol was not increased at higher drug concentrations. These observations suggest that tolerance may not be due to drug-specific mechanisms. Tolerance was of the phenotypic type, although increased tolerance appeared to emerge after prolonged drug exposure in vivo. This study suggests that drug tolerance may be an important determinant of the outcome of therapy for tuberculosis.

* Corresponding author. Mailing address: Case Western Reserve University School of Medicine, BRB 1034, 2109 Adelbert Rd., Cleveland, Ohio 44106-4984. Phone: (216) 368-4844. Fax: (216) 368-2034. E-mail: rsw2{at}po.cwru.edu.

dagger Present address: Communicable Disease Cluster of the World Health Organization, Geneva, Switzerland.

Antimicrobial Agents and Chemotherapy, November 1999, p. 2600-2606, Vol. 43, No. 11
0066-4804/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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