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. 2019 Jan 24;13(2):265–271. doi: 10.31616/asj.2018.0073

Table 1.

Definitions relating to TB and resistance patterns

Definitions
Mono-resistance Resistance to one first-line anti-TB drug only
Poly resistance Resistance to more than one first-line anti-TB drug (other than both isoniazid and rifampicin)
Multidrug resistance Resistance to at least both Isoniazid and rifampicin
Extensively drug resistance Resistance to any fluoroquinolone and to at least one of the three second-line injectable drugs (capreomycin, kanamycin, and amikacin), in addition to multidrug resistance
Rifampicin resistance Resistance to rifampicin detected using phenotypic or genotypic methods, with or without resistance to other anti-TB drugs. It includes any resistance to rifampicin, whether mono-resistance, multidrug resistance, poly-drug resistance or extensive drug resistance
Primary resistance Patients may be erroneously labelled as having primary resistance if they do not disclose previous treatment for TB.
Acquired resistance Patients who fail treatment (and are therefore labelled to have acquired resistance) may have been infected with a resistant strain from the beginning or acquired resistance during treatment.

TB, tuberculosis.