The critical concentrations for culture-based phenotypic drug susceptibility testing (DST) to first-line anti-TB drugs have been revised by the the World Health Organization (WHO). Critical concentrations for rifampicin have been lowered while those for isoniazid have been maintained at the present level. This update helps address the discordance observed between phenotypic and molecular methods to detect rifampicin resistance and improves the accuracy of DST. As a result patients with TB will have a more accurate diagnosis.The revision was the outcome of a Technical Expert Group meeting convened by WHO in 2020 to assess the results of a systematic review of published literature on critical
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