HIV/AIDS Glossary

Extensively Drug-Resistant Tuberculosis (XDR-TB)

A relatively rare type of multidrug-resistant tuberculosis (MDR-TB). Extensively drug-resistant tuberculosis (XDR-TB) occurs when a Mycobacterium tuberculosis strain becomes resistant to the first-line anti-TB drugs isoniazid and rifampin, plus any fluoroquinolone and at least one of the three second-line injectable drugs. XDR-TB progresses more rapidly and is more severe in people who have both XDR-TB and HIV than in people who only have XDR-TB.

Related Term(s): Mycobacterium Tuberculosis, Multidrug-Resistant Tuberculosis, Tuberculosis

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