Chidachi ndi choyenera kuzindikira zamtundu waukulu wa masinthidwe amtundu wa sputum wa anthu omwe amasonkhanitsidwa kuchokera ku Tubercle bacillus positive odwala omwe amatsogolera ku mycobacterium tuberculosis isoniazid kukana: InhA promotioner region -15C>T, -8T>A, -8T>C;Chigawo cholimbikitsa cha AhpC -12C>T, -6G>A;kusintha kwa homozygous kwa KatG 315 codon 315G>A, 315G>C.