title: Antibiotic sensitivity of an Argentine strain collection of Moraxella bovis.
abstract: The antimicrobial susceptibility of 88 isolates of Moraxella bovis of Argentine origin was evaluated for 12 antimicrobials by broth microdilution procedures. The isolates had a minimum inhibitory concentration (MIC90) of < or = 0.06 microg/mL to enrofloxacin; < or = 0.12 microg/mL to ceftiofur; < or = 0.25 microg/mL to ampicillin; < or = 0.5 microg/mL to florfenicol and gentamicin; < or = 1.0 microg/mL to tilmicosin, erythromycin, and oxytetracycline; < or = 4.0 microg/mL to tylosin; < or = 8.0 microg/mL to spectinomycin; < or = 0.25/4.75 microg/mL to trimethoprim/sulfamethoxazole; and > or = 32 microg/mL to lincomycin. Modal MIC values for these antimicrobials were as follows: enrofloxacin, 0.03 microg/mL; ceftiofur, 0.06 pg/mL; ampicillin, 0.25 microg/mL; florfenicol, gentamicin, erythromycin, and oxytetracycline, 0.5 microg/mL; tilmicosin, 1.0 microg/mL; tylosin and spectinomycin, 4.0 microg/mL; lincomycin and erythromycin, 16 microg/mL; and trimethoprim/ sulfamethoxazole, < or = 0.25/4.75 microg/mL. These data show that all antimicrobials except lincomycin have MICs suggestive of sensitivity in vitro, though confirmation of clinical efficacy can only be properly assessed based on pharmacologic and/or clinical data to support the MIC values.
authors.affiliation: Estacion Experimental Marcos Juarez, INTA, Córdoba, Argentina.
authors.forename: G
authors.initials: G
authors.lastname: Zielinski
authors.forename: H
authors.initials: H
authors.lastname: Piscitelli
authors.forename: H
authors.initials: H
authors.lastname: Perez-Monti
authors.forename: L A
authors.initials: LA
authors.lastname: Stobbs
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001118:Argentina; D024881:Drug Resistance, Bacterial; D008826:Microbial Sensitivity Tests; D016955:Moraxella bovis / Q000187:drug effects*
chemical_list: D000900:Anti-Bacterial Agents