WHO operational handbook on tuberculosis Module 3: Diagnosis - Rapid diagnostics for tuberculosis detection. Web Annex B. Critical concentrations for pretomanid and cycloserine. WHO policy statement. Third Edition

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WHO policy statement 

Strengthening health delivery systems is critical to achieving the global targets towards ending the tuberculosis (TB) epidemic; such strengthening includes introducing accurate diagnostic methods for detection of resistance to anti-TB agents.1 Pretomanid and cycloserine are used to treat individuals with drug-resistant TB. However, there is no established phenotypic drug susceptibility testing method or interpretive criteria to define resistance.