No. of Strains Susceptibility to indicated druga
RIF INH STR EMB
28 Rb R R R
4 R R Sc S
2 R R R S
1 R R S R
Table 1: Drug susceptibility patterns of MDR M. tuberculosis strains; a RIF-rifampcin; INH-isoniazid; EMB-ethambutol; STR-streptomycin, bR-resistant, cS-sensitive