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Updated: Jul 17, 2026

System for Efficacy and Cytotoxicity Screening of Inhibitors Targeting Intracellular Mycobacterium tuberculosis
Published on: April 5, 2017
Minimal inhibitory concentration of isoniazid in isoniazid-resistant Mycobacterium tuberculosis isolates from
H S Schaaf1, T C Victor, E Engelke
1Desmond Tutu Tuberculosis Centre, Department of Paediatrics and Child Health, Faculty of Health Sciences, Stellenbosch University, P.O. Box 19063, Tygerberg 7505, South Africa. hss@sun.ac.za
Abstract:
The aim of the study presented here was to determine the minimal inhibitory concentration of isoniazid for strains of isoniazid-resistant or multidrug-resistant Mycobacterium tuberculosis isolated from children in the Western Cape Province of South Africa. During the period March 2003-October 2005, 45 INH-resistant M. tuberculosis isolates (21 also rifampicin-resistant) were cultured from children less than 13 years of age. Drug susceptibility testing by the radiometric BACTEC 460 method found 11 isolates resistant at 0.1 microg/ml, 27 resistant at 0.2 microg/ml, and seven resistant at > or =5 microg/ml. Thus, the minimal inhibitory concentration of isoniazid for more than 80% of the isoniazid-resistant strains isolated from children in this study was relatively low and could be exceeded by high-dose (15-20 mg/kg) isoniazid regimens.
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