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Int J Antimicrob Agents. 2007 Jul;30(1):83-6. Epub 2007 May 18.

In vitro activities of faropenem, ertapenem, imipenem and meropenem against Borrelia burgdorferi s.l.

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Institute of Medical Microbiology & Infection Control, University Hospital of Frankfurt, Paul-Ehrlich Str. 40, D-60596 Frankfurt/Main, Germany.


Little is known about the in vitro activity of penems and carbapenems against the spirochete Borrelia burgdorferi. Here, faropenem, ertapenem, imipenem and meropenem as well as the third-generation cephalosporin ceftriaxone and tobramycin were tested in vitro against 11 isolates of the B. burgdorferi sensu lato complex. On a microg/mL basis, ertapenem was the most potent carbapenem (minimal inhibitory concentration (MIC) range: 0.015-0.125 microg/mL), with in vitro activity comparable with that of ceftriaxone against Borrelia. These findings are supported by the results of time-kill experiments in a Borrelia afzelii skin isolate, demonstrating a >3 log10 unit (99.9%) reduction of the inoculum after 96 h of exposure to either drug at a concentration of three log2 unit dilutions above the respective MIC.

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