Extensively Drug-resistant TB
MDR-TB can become resistant to the major second-line drug groups: fluoroquinolones and injectable drugs. When MDR-TB is resistant to at least one drug from each group, it's defined as extensively drug-resistant tuberculosis (XDR-TB).
In a study of MDR-TB patients from 2005 to 2008 in various countries, 43.7% had resistance to at least one second-line drug.
Read more about this topic: Multi-drug-resistant Tuberculosis
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