Resistance Levels and rpoB Gene Mutations among In Vitro-Selected Rifampin-Resistant Mycobacterium tuberculosis Mutants

Author:

Huitric Emma12,Werngren Jim12,Juréen Pontus12,Hoffner Sven1

Affiliation:

1. Department of Bacteriology, Swedish Institute for Infectious Disease Control Solna, and

2. Department of Microbiology, Tumor and Cell Biology Center, Karolinska Institute, Stockholm, Sweden

Abstract

ABSTRACT The distribution and resistance levels of 189 in vitro-selected rifampin-resistant Mycobacterium tuberculosis mutants of Beijing and other genotypes were determined. Apart from a higher amount of codon 522 point mutations and large deletions, a spread of mutations similar to that reported for clinical isolates was seen. Most mutations were correlated with high-level resistance; a lower level, or a MIC of <16 mg/liter, was associated with codon 522 mutations. Multiple mutations were detected in two Beijing mutants.

Publisher

American Society for Microbiology

Subject

Infectious Diseases,Pharmacology (medical),Pharmacology

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