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Updated: May 31, 2026

A High-throughput Compatible Assay to Evaluate Drug Efficacy against Macrophage Passaged Mycobacterium tuberculosis
Published on: March 24, 2017
Low-level rifampicin-resistant Mycobacterium tuberculosis strains raise a new therapeutic challenge
J van Ingen1, R Aarnoutse, G de Vries
1Department of Pulmonary Diseases, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands. jakko.vaningen@gmail.com
Abstract:
In an outbreak of multidrug-resistant tuberculosis, the outbreak strain had an Asp516Tyr rpoB gene mutation. Phenotypically, low-level rifampicin (RMP) resistance (minimum inhibitory concentration [MIC] 1-2 mg/l) was observed. Based on drug susceptibility test results, three patients were treated with 12-15 month rifabutin-based regimens and one with a 12-month RMP-based regimen. We retrospectively performed pharmacokinetic calculations to assess the potential for RMP treatment, from which we conclude that MICs for RMP up to 1 μg/ml may be safely overcome by applying 20 mg/kg RMP doses in treatment regimens.
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