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JAC Advance Access published online on June 16, 2004
Journal of Antimicrobial Chemotherapy, doi:10.1093/jac/dkh328
© 2004 by The British Society for Antimicrobial Chemotherapy
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Received March 10, 2004
Revised May 12, 2004
Accepted May 18, 2004

Brief report

CS-023 (R-115685), a novel carbapenem with enhanced in vitro activity against oxacillin-resistant staphylococci and Pseudomonas aeruginosa

Kenneth S. Thomson 1* Ellen Smith Moland 1

1 Center for Research in Anti-Infectives and Biotechnology, Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, NE 68178, USA

* To whom correspondence should be addressed. E-mail: kstaac{at}creighton.edu.


  Abstract

Objective: To compare the in vitro activities of the carbapenem, CS-023, four representative {beta}-lactam antibiotics and levofloxacin, against 970 Gram-positive or Gram-negative US clinical isolates.

Methods: Susceptibilities of bacteria chosen for their varying levels of resistance to the comparator agents were determined by NCCLS microdilution methodology.

Results: CS-023 exhibited activity comparable to that of imipenem against most Gram-positive isolates, but was ~8-fold more potent against oxacillin-resistant staphylococci. It was comparable to meropenem against most Gram-negative isolates, but was 4- to 8-fold more potent against five isolates of meropenem-resistant Pseudomonas aeruginosa.

Conclusions: If tissue and body fluid concentrations >8 mg/L can safely be achieved, further studies of CS-023 are warranted to determine its clinical efficacy.

Keywords: carbapenems; {beta}-lactams; imipenem; meropenem
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