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BACKGROUND Drug-resistant tuberculosis threatens efforts to control the disease. This report describes the prevalence of resistance to four first-line drugs in 35 countries participating in the World(More)
SETTING Quality assurance of the WHO/IUATLD global tuberculosis drug resistance surveillance programme. OBJECTIVE To perform a proficiency test of drug susceptibility procedures within the(More)
The emergence of strains of Mycobacterium tuberculosis that are resistant to antimycobacterial agents is a worldwide problem whose global magnitude is not well described. We reviewed and tabulated 63(More)