Epistasis between antibiotic resistance mutations drives the evolution of extensively drug-resistant tuberculosis

Abstract excerpt

BACKGROUND AND OBJECTIVES: Multidrug resistant (MDR) bacteria are a growing threat to global health. Studies focusing on single antibiotics have shown that drug resistance is often associated with a fitness cost in the absence of drug. However, little is known about the fitness cost associated with resistance to multiple antibiotics. METHODOLOGY: We used Mycobacterium smegmatis as a model for human tuberculosis...

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