Among the 54 RIF resistant TB strains detected by this test, the frequency of rpoB mutations was: 27 S531L (50%), 6 H526Y (10.9%), 3 D516V (5.5%), 1 H526D (1.8%), 7 missing WT2 (12.7%), 10 missing WT3 (18.1%), 6 missing WT4 (10.9%), 14 missing WT7 (25.5%), 26 missing WT8 (48%), and no case missing WT1, WT5 or WT6. The gene discussed is WT1; the disease is tuberculosis.