Extensively drug-Resistant Tuberculosis (XDR-TB) is resistant to first-line drugs and three or more of the six classes of second-line drugs.

Name: Extensively drug-Resistant Tuberculosis (XDR-TB) is resistant to first-line drugs and three or more of the six classes of second-line drugs.
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XDR-TB is defined as tuberculosis that is resistant to at least four of the core anti-TB drugs, including resistance to first-line drugs and at least three of the six classes of second-line drugs.

Extensively Drug-Resistant Tuberculosis (XDR-TB) Is Resistant to First-Line Drugs and Three