Research Article
1 March 1980

Comparison of in vitro activity of moxalactam (LY127935) with cefazolin, amikacin, tobramycin, carbenicillin, piperacillin, and ticarcillin against 420 blood culture isolates

Abstract

To compare the in vitro activity of moxalactam (LY127935), a new broad-spectrum antimicrobial agent, with cefazolin, amikacin, tobramycin, carbenicillin, piperacillin, and ticarcillin, each drug was tested against 420 bacterial isolates from the blood of septic patients. Standard broth dilution methods were used to determine minimum inhibitory and bactericidal concentrations. LY127935 was as active as the aminoglycosides against aerobic gram-negative organisms, including Pseudomonas aeruginosa, and was at least 10-fold more active than the other beta-lactam agents against these bacteria. LY127935 was the most active agent tested against Bacteroides fragilis; its activity against all other anaerobic bacteria and Staphylococcus aureus was similar to those of the other agents tested. All streptococci, however, grew at higher concentrations of LY127935 than any other drug, and Streptococcus faecalis and Listeria monocytogenes were not inhibited at the highest concentration tested (minimum inhibitory concentration, > 64 microgram/ml). Although a greater proportion of blood culture isolates were susceptible to LY127935 than to any other drug tested, LY127935 does not have a sufficiently broad spectrum of in vitro activity to be recommended safely alone for empirical treatment of sepsis of unknown etiology.

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cover image Antimicrobial Agents and Chemotherapy
Antimicrobial Agents and Chemotherapy
Volume 17Number 3March 1980
Pages: 412 - 416
PubMed: 6448577

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Published online: 1 March 1980

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