a previous study revealed the emergence of high-level resistance to trimethoprim-sulfamethoxazole in strains of escherichia coli isolated from 95 % of students from the united states who were taking either trimethoprim alone or trimethoprim-sulfamethoxazole for prophylaxis of travelers ' diarrhea while in guadalajara , mexico .
C0041041
trimethoprim
C0041044
trimethoprim-sulfamethoxazole