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J Antimicrob Chemother. 2001 Oct;48(4):563-7.

Activity of daptomycin against Gram-positive pathogens: a comparison with other agents and the determination of a tentative breakpoint.

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Department of Microbiology, City Hospital NHS Trust, Birmingham B18 7QH, UK.


The in vitro activity of daptomycin was studied in comparison with other agents active against 328 recent clinical isolates of Gram-positive pathogens. MIC data showed that the addition of calcium ions to a final concentration of 50 mg/L enhanced the activity of daptomycin generally by eight- to 16-fold. In the presence of calcium ions daptomycin was uniformly active against the strains of Staphylococcus spp. and Streptococcus spp. studied with a MIC90 of < or = 1 mg/L. Enterococcus faecalis and Enterococcus faecium were slightly less susceptible (MIC90 2 mg/L). Vancomycin-, fluoroquinolone- and quinupristin/dalfopristin-resistant strains were all susceptible to daptomycin. The presence of serum reduced the apparent activity of daptomycin to only a moderate extent. Employing the BSAC methodologies, a tentative breakpoint of 2 mg/L for daptomycin is proposed.

[Indexed for MEDLINE]

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