What is Extensively Drug-Resistant Tuberculosis (XDR-TB)?
Extensively Drug-Resistant Tuberculosis (XDR-TB) is a severe form of multidrug-resistant tuberculosis (MDR-TB). It is characterized by resistance to at least four of the core anti-TB drugs. Specifically, XDR-TB is resistant to isoniazid and rifampicin (the two most powerful first-line treatment drugs), any fluoroquinolone, and at least one of the second-line injectable drugs (amikacin, kanamycin, or capreomycin).
