Evaluation of BRL 42715, a beta-lactamase-inhibiting penem.
BRL 42715 is a new penem which inhibits a wide range of plasmid as well as chromosomally mediated bacterial beta-lactamases. We used a total of 902 recent clinical isolates, consisting of 455 Enterobacteriaceae, 247 staphylococci and 200 other gram-negative bacteria to evaluate its ability for potentiation of amoxycillin. MICs for all the 104 strains of methicillin-susceptible Staphylococcus aureus were reduced from 8-greater than 32.0 to less than or equal to 0.06 micrograms/ml in the presence of 1-5 micrograms/ml of this penem. It was also highly effective in inhibiting the beta-lactamase of a wide variety of gram-negative bacteria, thereby bringing their MIC values for amoxycillin from a 'resistant' range (greater than 32.0 micrograms/ml) to a 'susceptible' range (less than or equal to 8.0 micrograms/ml). Commonly resistant bacteria like Klebsiella, Enterobacter, Citrobacter, Morganella, Serratia, Acinetobacter and Aeromonas were rendered susceptible to amoxycillin in the presence of 1.0-5.0 micrograms/ml of BRL 42715.
Qadri
S M
SM
King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia.
Ueno
Y
Y
Burdette
M
M
Kroschinsky
R
R
Almodovar
E
E
D000658:Amoxicillin / Q000494:pharmacology*; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D004357:Drug Synergism; D004359:Drug Therapy, Combination / Q000494:pharmacology; D004755:Enterobacteriaceae / Q000187:drug effects; D006090:Gram-Negative Bacteria / Q000187:drug effects*; D006094:Gram-Positive Bacteria / Q000187:drug effects*; D006801:Humans; D007769:Lactams; D008826:Microbial Sensitivity Tests; D065093:beta-Lactamase Inhibitors; D047090:beta-Lactams
D000900:Anti-Bacterial Agents; D007769:Lactams; D065093:beta-Lactamase Inhibitors; D047090:beta-Lactams; C061593:C6-(N1-methyl-1,2,3-trazolylmethylene)penem; D000658:Amoxicillin