External quality control of Mycobacterium tuberculosis drug susceptibility testing: results of two rounds in endemic countries

Int J Tuberc Lung Dis. 2008 Feb;12(2):214-7.


Setting: Quality assurance for the World Health Organization (WHO)/International Union Against Tuberculosis and Lung Disease (The Union) global tuberculosis (TB) drug resistance surveillance programme.

Objective: To monitor the quality of drug susceptibility testing (DST) in different countries.

Methods: In 2002-2003 and 2005-2006, 20 Mycobacterium tuberculosis strains were sent by the WHO/Union Supranational Reference Laboratory of Rome to TB reference laboratories in Albania, Bahrain, Kosovo, Mozambique, Oman, Qatar and Turkey for external quality control (EQC).

Results: In 2002-2003, the specificity, sensitivity, efficiency, reproducibility and predictive values for resistance/susceptibility were >or=90% for streptomycin (SM), isoniazid (INH) and ethambutol (EMB). In 2005-2006, all statistical values were >or=96% for SM, INH, rifampicin and EMB.

Conclusion: EQC improved the quality of M. tuberculosis DST in the participating countries.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antitubercular Agents / pharmacology*
  • Humans
  • Microbial Sensitivity Tests / standards*
  • Mycobacterium tuberculosis / drug effects*
  • Quality Control
  • Sensitivity and Specificity
  • Tuberculosis, Pulmonary / drug therapy*
  • Tuberculosis, Pulmonary / epidemiology


  • Antitubercular Agents