Definitions for "Multidrug-resistant TB"
active TB disease caused by bacteria resistant to two or more of the most important medicines: INH and RIF.
TB disease caused by an M. tuberculosis strain that is resistant to at least INH and rifampin. Treatment regimens for curing MDR TB are long, expensive, and difficult to tolerate. The cure rate depends on the susceptibility of M. tuberculosis to alternative chemotherapy.
TB that is resistant to isoniazid and rifampin; more difficult to treat than drug-susceptible TB