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- Mono-resistance: resistance to one anti-TB drug
- Poly-resistance: resistance to more than one anti-TB drug, but not both H and R
- Multidrug-resistance (MDR): resistance to at least H and R
- Extensive drug-resistance: in addition to MDR, resistance to any fluoroquinolone, and at least one of three injectable second-line drugs (capreomycin, kanamycin and amikacin)
- Rifampicin resistance: resistance to R detected using phenotypic or genotypic methods, with or without resistance to other anti-TB drugs.
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