Prevalence of and risk factors for resistance to second-line drugs in people with multidrug-resistant tuberculosis in eight countries: a prospective cohort study

The prevalence of extensively drug-resistant (XDR) tuberculosis is increasing, due to the expanded use of
second-line drugs in people with multidrug-resistant (MDR) disease. This study assesses resistance to secondline
antituberculosis drugs in eight countries.

Document Date: 30 August, 2012
Author: Tracy Dalton and others