ABCB4 and tuberculosis: There were four main types of primary MDR-TB, for instance, MDR1 (INH + RFP), MDR2 (INH + RFP + EMB), MDR3 (INH + RFP + EMB + SM), and MDR4 (INH + RFP + SM), which accounted for 0.71%(81), 0.13%(15), 0.72%(83), 1.45%(166) respectively.