Tuberculosis (TB)

WHO Global Task Force on TB Impact Measurement

Frequently-asked questions

What are the main recommendations of the Task Force?

Frequently-asked questions

The main recommendations of the Task Force have been defined as a 13-point policy package, shown below.

WHO policy package for measuring TB incidence, prevalence and mortality from 2008 to 2015 and beyond

General
  • 1. Improve surveillance systems to include all incident cases in TB case notification data and to account for all (or almost all) TB deaths in vital registration systems.
  • 2. Strengthen national capacity to monitor and evaluate the TB epidemic and to measure progress in global TB control.
  • 3. Review and update periodically the data, assumptions and analytical methods used to produce WHO estimates of TB incidence, prevalence and mortality rates.
  • 4. Report by Task Force on whether 2015 MDG and Stop TB Partnership targets are achieved (or not), shortly after 2015.
Measuring TB incidence
  • 5. Analyse periodically the reliability and coverage of case notification data, using a standard framework, in order to estimate the total number of incident TB cases and trends in incidence rates.
  • 6. Certify and/or validate TB notification data for countries where analyses using the standard framework show that TB notification data are a close proxy (direct measure) of TB incidence.
  • 7. Cross-validate estimates of TB incidence using TB mortality data from vital registration systems.
Measuring TB prevalence
  • 8. Survey the prevalence of TB disease in 21 global focus countries according to WHO guidelines and Task Force recommendations.
  • 9. Produce indirect estimates of TB prevalence based on estimates of TB incidence and the duration of TB disease for countries where surveys of the prevalence of TB disease are not implemented.
Measuring TB mortality
  • 10. Develop national vital registration systems to reliably record all TB deaths.
  • 11. Initiate sample vital registration where national vital registration systems are not yet available.
  • 12. Produce indirect estimates of TB mortality using estimates of TB incidence and case fatality rates for countries without reliable national or sample vital registration systems.
Evaluating the impact of TB control activities
  • 13. Conduct studies periodically to evaluate the impact of control activities on rates of TB incidence, prevalence and mortality.
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