fecal specimens from individuals traveling to mexico were examined before , during , and after travel for the presence of escherichia coli resistant to ampicillin , chloramphenicol , gentamicin , kanamycin , streptomycin , sulfonamides , trimethoprim ( tmp ) , and tmp-sulfamethoxazole ( tmp-smx ) .
C0038760
sulfonamides
C0038689
smx