eight antibacterial agents , cephalothin , colistin , doxycycline , erythromycin , gentamicin , chloramphenicol , oxytetracycline and trimethoprim were studied in a phagocytic system using human polymorphonuclear cells ( pmn ) and a radio-labelled strain of escherichia coli as test microbe .
C0279516
antibacterial agents
C0041041
trimethoprim