Assertion: resistant tb | /r/CreatedBy | strains of mycobacteria
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text: Extremely drug resistant TB (XDR-TB) is the most severe form of the disease, caused by strains of mycobacteria which are not only resistant to isoniazid and rifampin, but also show resistance to fluroquinolones and at least one of three injectable second line anti-tubercular drugs (amikacin, kanamycin, and/or capreomycin)