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Table 2 Diagnostic algorithms predefined for the model

From: Target prioritization and strategy selection for active case-finding of pulmonary tuberculosis: a tool to support country-level project planning

Strategy Description First screening Second screening Diagnostic test Maximum proportional yield* Example in Figure2(d) condition***
1 Basic routine programme model Symptom Microscopy PYss 24%
2 Strategy 1 + smear-negative diagnosis with X-ray Symptom Microscopy X-ray PYss + part** PYsc 24–40%
3 X-ray + symptom screening Symptom X-ray Microscopy PYss+PYxs+part** (PYsc+PYxc) 60%–100%
4 Prevalence survey model Symptom X-ray Microscopy Culture PYss+PYsc+PYxs+PYxs 100%
5 Xpert in Strategy 4 Symptom X-ray Xpert PYss+PYsc+PYxs+PYxs 100%
6 Restrictive screening + Xpert Symptom X-ray Xpert PYss+PYsc 40%
  1. * PY: Proportional yield (a proportion of prevalent TB cases by symptomatic and smear statuses). Please see Table 1.
  2. ** A diagnostic sensitivity of smear-negative TB can vary depending on the programmatic setup.
  3. *** A maximum proportion of TB cases that can be diagnosed.