title: [In vitro study of the pefloxacine-ceftriaxone combination against 18 strains of Acinetobacter].
abstract: The bacteriostatic and bactericidal activity of the pefloxacin-ceftriaxone combination was studied in Mueller-Hinton broth against 18 clinical strains of acinetobacter calcoaceticus var. anitratum by the checkerboard technique. The bactericidal activity was tested after 2, 4, 6 and 24 hours contact. MICs were 0.12 to 4 mg/l for pefloxacin and 2 to 64 mg/l for ceftriaxone. The bacteriostatic interaction of the antibiotics was synergistic for 5 strains (FIC index = 0.375 to 0.5) and additive for 13 strains (FIC index = 0.51 to 1). The bactericidal interaction was synergistic for 1 strain after 2 hours, 3 strains after 4 hours, 6 strains after 6 hours, and 12 strains after 24 hours. By the FBC technique at 24 hours, the combination was synergistic for 5 strains (FBC index = 0.375 to 5) and additive for 13 strains (FBC index = 0.51 to 1). No antagonism was detected. The combination is mainly additive but synergism is observed for some strains of acinetobacter. Ceftriaxone prevented the late regrowth noted with pefloxacin.
mesh_terms: D000150:Acinetobacter / Q000187:drug effects*; D002443:Ceftriaxone / Q000008:administration & dosage / Q000494:pharmacology*; D004338:Drug Combinations; D004357:Drug Synergism; D066298:In Vitro Techniques; D008826:Microbial Sensitivity Tests / Q000379:methods; D009643:Norfloxacin / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology; D015366:Pefloxacin; D013997:Time Factors
chemical_list: D004338:Drug Combinations; D015366:Pefloxacin; D002443:Ceftriaxone; D009643:Norfloxacin
vernacular_title: Etude in vitro de l'association péfloxacine-ceftriaxone vis-à-vis de dix-huit souches d'Acinetobacter.