what is xdr tuberculosis
Extensively drug-resistant TB (XDR TB) is a rare type of multidrug-resistant tuberculosis (MDR TB) that is resistant to isoniazid and rifampin, plus any fluoroquinolone and at least one of three injectable second-line drugs (i.e., amikacin, kanamycin, or capreomycin).rug-resistant TB (MDR or XDR) is more common in people who: 1  Do not take their TB medicine regularly. 2  Do not take all of their TB medicines as prescribed by their doctor. 3  Develop TB disease again, after having taken TB medicine in the past.