58 % of the strains were susceptible to sulfamethoxazole alone ( mic less than or equal to 16 micrograms/ml ) , only 12 % were susceptible to trimethoprim alone ( less than or equal to 1 microgram/ml ) , and 85 % were susceptible to the combination of sulfamethoxazole plus trimethoprim ( less than or equal to 16 micrograms/ml ) at a ratio of 19:1 .
C0041041
trimethoprim
C0041044
combination