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JAC Advance Access originally published online on June 20, 2006
Journal of Antimicrobial Chemotherapy 2006 58(2):338-343; doi:10.1093/jac/dkl235
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© The Author 2006. Published by Oxford University Press on behalf of the British Society for Antimicrobial Chemotherapy. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Comparative activity of the new lipoglycopeptide telavancin in the presence and absence of serum against 50 glycopeptide non-susceptible staphylococci and three vancomycin-resistant Staphylococcus aureus

Kimberly D. Leuthner1,2,{dagger}, Chrissy M. Cheung1 and Michael J. Rybak1–,3,*

1 Anti-Infective Research Laboratory, Department of Pharmacy Practice, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University Detroit, MI 48201, USA 2 Detroit Receiving Hospital Detroit, MI 48201, USA 3 School of Medicine, Wayne State University Detroit, MI 48201, USA

Received 17 November 2005; returned 10 March 2006; revised 9 May 2006; accepted 11 May 2006

*Correspondence address. Anti-Infective Research Laboratory, Department of Pharmacy Practice—4148, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, 259 Mack Avenue, Detroit, MI 48201, USA. Tel: +1-313-577-4376; Fax: +1-313-577-8915; E-mail: m.rybak{at}wayne.edu

Background: Telavancin, a new multifunctional lipoglycopeptide antibiotic, exhibits broad-spectrum Gram-positive activity against a variety of pathogens. We examined the effects of human serum and antimicrobial concentrations on the activity of telavancin against glycopeptide-intermediate staphylococcal species (GISS), heteroresistant GISS (hGISS) and three vancomycin-resistant Staphylococcus aureus (VRSA) compared with vancomycin, quinupristin/dalfopristin, linezolid and daptomycin.

Methods: MIC and MBCs were performed against all antimicrobials. Time–kill experiments were performed using two strains of GISS (Mu50; NJ992) and VRSA (VRSAMI; VRSAPA) at 1, 2, 4, 8, 16 and 32x MIC. Telavancin and daptomycin were evaluated in the presence and absence of serum.

Results: All GISS and hGISS were susceptible to the tested agents with telavancin and quinupristin/dalfopristin demonstrating the lowest MIC, followed by daptomycin, linezolid and vancomycin. Against VRSA, daptomycin and quinupristin/dalfopristin had the lowest MIC, followed by linezolid, telavancin and vancomycin. In the presence of serum, telavancin and daptomycin MICs increased 1- to 4-fold. Concentration-dependent activity was demonstrated by telavancin and daptomycin, in the presence and absence of serum. Telavancin and daptomycin were bactericidal against GISS and performed similarly in the presence of serum. Quinupristin/dalfopristin demonstrated bactericidal activity at clinically achievable concentrations, whereas linezolid was bacteriostatic.

Conclusions: Telavancin demonstrated concentration-dependent bactericidal activity against GISS, hGISS and VRSA at concentrations equal to or above 4x MIC, which corresponds to therapeutic levels against GISS and clinically achieved concentrations against the VRSA. Similar to daptomycin, telavancin activity was diminished in the presence of serum but bactericidal activity was maintained. Further investigation with telavancin against GISS, hGISS and VRSA is warranted.

Keywords: methicillin-resistant Staphylococcus aureus , pharmacodynamics , daptomycin , VRSA


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