In vitro comparison of GR69153, a novel catechol-substituted cephalosporin, with ceftazidime and ceftriaxone against 5,203 recent clinical isolates.
The activity of GR69153, a novel catechol-substituted cephalosporin, was compared with those of ceftazidime and ceftriaxone in a multicenter study against 5,203 fresh clinical isolates of gram-negative and gram-positive bacteria. GR69153 was generally very active at concentrations equivalent to or two- to fourfold lower than those of ceftazidime and ceftriaxone against gram-negative bacilli other than Citrobacter freundii, Enterobacter cloacae, and Xanthomonas maltophilia. Against Pseudomonas aeruginosa, MICs of GR69153 and ceftazidime for 50% of isolates tested (MIC50s) were, respectively, 1 and 2 micrograms/ml; the corresponding MIC90s were 4 and 16 micrograms/ml. Although MIC50s of GR69153 for staphylococci were two- to eightfold lower than those of ceftazidime or ceftriaxone, MIC90s against staphylococci and enterococci were greater than or equal to 16 micrograms/ml for all three compounds. Quality control MIC ranges for reference strains are proposed for the broth microdilution method on the basis of the GR69153 data derived from this multicenter study.
Washington
J A
JA
Cleveland Clinic Foundation, Ohio 44195.
Jones
R N
RN
Allen
S D
SD
Gerlach
E H
EH
Koontz
F P
FP
Murray
P R
PR
Pfaller
M A
MA
Erwin
M E
ME
D001419:Bacteria / Q000187:drug effects*; D001424:Bacterial Infections / Q000382:microbiology; D002442:Ceftazidime / Q000494:pharmacology*; D002443:Ceftriaxone / Q000494:pharmacology*; D002511:Cephalosporins / Q000494:pharmacology*; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D006801:Humans; D008826:Microbial Sensitivity Tests
D002511:Cephalosporins; C066944:GR 69153; D002443:Ceftriaxone; D002442:Ceftazidime