Diseases & National Health Programme
As per the WHO definition, XDR –TB is defined as
|A||Resistant to at least INH and rifampicin|
|B||resistant to fluoroquinolones|
|C||resistant to at least to of the inject able drug for TB|
|D||all of the above|
Extensively drug resistant tuberculosis (XDR) – cases that are resistant to almost all second line drugs are termed XDR and are defined as occurring when M.tuberculosis is resistant to (i) rifampicin & INH (ii) resistant to fluoroquinolones & (iii) resistant to one or more of the following injectable drugs: amikacin, capreomycin & Kanamycin.