combinations of edta-tromethamine and 7 antimicrobial agents ( chloramphenicol , nalidixic acid , oxytetracycline , penicillin , polymyxin-b , streptomycin , or a combination of sulfamethazine , sulfapyridine , and sulfathiazole ) were tested for synergistic activities against proteus vulgaris of canine origin .
C1136254
antimicrobial agents
C0030092
oxytetracycline