drug-resistant tuberculosis [multidrug-resistant (mdr) or extensively drug-resistant (xdr)] is more common in people who: do not take their tb medicine regularly. do not take all of their tb medicines as told by their doctor or nurse. develop active tb disease again after having taken tb medicine in the past. come from areas of the world where drug-resistant tb is common. have spent time with someone known to have drug-resistant tb disease.
who is at risk for getting extensively drug-resistant (xdr) tuberculosis?