Table 3– Total number of tuberculosis (TB) drugs to which Mycobacterium tuberculosis strains were resistant by extensively drug-resistant (XDR)-TB patient group
XDR aloneXDR+2sliXDR+sliG4XDR+sliG4EZ
Subjects n301684842
Number of drugs to which the strain was resistant#
  • Data are presented as %, unless otherwise stated. Column totals may exceed 100% due to rounding. XDR alone: resistance to isoniazid and rifampicin, plus any fluoroquinolone and any second-line injectable drug (sli); XDR+2sli: XDR-TB, plus resistance to both an aminoglycoside injectable (kanamycin/amikacin) and to capreomycin; XDR+sliG4: XDR-TB, plus resistance to all second-line TB drugs tested, with, as a minimum, resistance to kanamycin and to at least one group 4 (G4) drug; XDR+sliG4EZ: XDR-TB, plus resistance to all first- and second-line TB drugs tested, with, as a minimum resistance to kanamycin, one group 4 drug and either pyrazinamide (Z) and/or ethambutol (E). #: the number of drugs includes isoniazid, rifampicin and at least one fluoroquinolone and one second-line injectable, so all patients were resistant to at least one drug in addition to these four.