Extensively Drug-Resistant Tuberculosis

**Definition:** Tuberculosis resistant to ISONIAZID and RIFAMPIN and at least three of the six main classes of second-line drugs (AMINOGLYCOSIDES; polypeptide agents; FLUOROQUINOLONES; THIOAMIDES; CYCLOSERINE; and PARA-AMINOSALICYLIC ACID) as defined by the CDC.

**Tree numbers:** - C01.150.252.410.040.552.846.775.500

**Synonyms:** - XDR-TB - Extremely Drug-Resistant Tuberculosis - Tuberculosis, Extensively Drug-Resistant - Tuberculosis, Extremely Drug-Resistant