edoc

Gentamicin improves the activities of daptomycin and vancomycin against Enterococcus faecalis in vitro and in an experimental foreign-body infection model

Furustrand Tafin, Ulrika and Majic, Ivana and Zalila Belkhodja, Cyrine and Betrisey, Bertrand and Corvec, Stéphane and Zimmerli, Werner and Trampuz, Andrej. (2011) Gentamicin improves the activities of daptomycin and vancomycin against Enterococcus faecalis in vitro and in an experimental foreign-body infection model. Antimicrobial Agents and Chemotherapy, Vol. 55, H. 10. pp. 4821-4827.

Full text not available from this repository.

Official URL: http://edoc.unibas.ch/dok/A6004751

Downloads: Statistics Overview

Abstract

For enterococcal implant-associated infections, the optimal treatment regimen has not been defined. We investigated the activity of daptomycin, vancomycin, and gentamicin (and their combinations) against Enterococcus faecalis in vitro and in a foreign-body infection model. Antimicrobial activity was investigated by time-kill and growth-related heat production studies (microcalorimetry) as well as with a guinea pig model using subcutaneously implanted cages. Infection was established by percutaneous injection of E. faecalis in the cage. Antibiotic treatment for 4 days was started 3 h after infection. Cages were removed 5 days after end of treatment to determine the cure rate. The MIC, the minimal bactericidal concentration (MBC) in the logarithmic phase, and the MBC in the stationary phase were 1.25, 5, and <20 ?g/ml for daptomycin, 1, <64, and <64 ?g/ml for vancomycin, and 16, 32, and 4 ?g/ml for gentamicin, respectively. In vitro, gentamicin at subinhibitory concentrations improved the activity against E. faecalis when combined with daptomycin or vancomycin in the logarithmic and stationary phases. In the animal model, daptomycin cured 25%, vancomycin 17%, and gentamicin 50% of infected cages. In combination with gentamicin, the cure rate for daptomycin increased to 55% and that of vancomycin increased to 33%. In conclusion, daptomycin was more active than vancomycin against adherent E. faecalis, and its activity was further improved by the addition of gentamicin. Despite a short duration of infection (3 h), the cure rates did not exceed 55%, highlighting the difficulty of eradicating E. faecalis from implants already in the early stage of implant-associated infection.
Faculties and Departments:03 Faculty of Medicine > Bereich Medizinische Fächer (Klinik) > Ehemalige Einheiten Medizinische Fächer (Klinik) > Allgemeine innere Medizin Liestal (Zimmerli)
03 Faculty of Medicine > Departement Klinische Forschung > Bereich Medizinische Fächer (Klinik) > Ehemalige Einheiten Medizinische Fächer (Klinik) > Allgemeine innere Medizin Liestal (Zimmerli)
03 Faculty of Medicine > Bereich Medizinische Fächer (Klinik) > Infektiologie > Infektiologie (Battegay M)
03 Faculty of Medicine > Departement Klinische Forschung > Bereich Medizinische Fächer (Klinik) > Infektiologie > Infektiologie (Battegay M)
UniBasel Contributors:Zimmerli, Werner and Trampuz, Andrej
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Society for Microbiology
ISSN:0066-4804
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:27 Mar 2014 13:13
Deposited On:27 Mar 2014 13:13

Repository Staff Only: item control page