title: Antianaerobe activity of ceftobiprole, a new broad-spectrum cephalosporin.
abstract: Agar dilution testing of 463 anaerobes showed most Gram-positive beta-lactamase-negative strains (other than some Clostridium difficile and Peptostreptococcus anaerobius), as well as both beta-lactamase-positive and beta-lactamase-negative strains of Fusobacterium nucleatum, to have ceftobiprole MIC values of < or =0.016 to 4 microg/mL. Ceftobiprole was less active against beta-lactamase-positive Gram-negative bacilli, especially the members of the Bacteroides fragilis group. Like ceftobiprole, piperacillin was active mainly against beta-lactamase-negative strains, though MIC values for piperacillin were often 1 to 2 dilutions higher than for ceftobiprole. Carbapenems had MIC values < or =4 microg/L against all except some C. difficile and 2 strains of B. fragilis. All strains were susceptible to metronidazole, and all bacteria, except C. difficile and a single Bacteroides distasonis strain, were susceptible to chloramphenicol. Clindamycin resistance was seen in most anaerobe groups, whereas high moxifloxacin MICs were found mainly among the B. fragilis and Prevotella groups, and a few C. difficile and F. nucleatum strains.
authors.affiliation: Department of Pathology, Hershey Medical Center, Hershey, PA 17033, USA.
authors.forename: Lois
authors.initials: L
authors.lastname: Ednie
authors.forename: Stuart
authors.initials: S
authors.lastname: Shapiro
authors.forename: Peter C
authors.initials: PC
authors.lastname: Appelbaum
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001421:Bacteria, Anaerobic / Q000187:drug effects*; D002511:Cephalosporins / Q000494:pharmacology*; D024881:Drug Resistance, Bacterial; D006090:Gram-Negative Bacteria / Q000187:drug effects*; D006094:Gram-Positive Bacteria / Q000187:drug effects*; D006801:Humans; D008826:Microbial Sensitivity Tests
chemical_list: D000900:Anti-Bacterial Agents; D002511:Cephalosporins; C443755:ceftobiprole