JOURNAL ARTICLE

In vitro activities of LTX-109, a synthetic antimicrobial peptide, against methicillin-resistant, vancomycin-intermediate, vancomycin-resistant, daptomycin-nonsusceptible, and linezolid-nonsusceptible Staphylococcus aureus

Louis D Saravolatz, Joan Pawlak, Leonard Johnson, Hector Bonilla, Louis D Saravolatz, Mohamad G Fakih, Anders Fugelli, Wenche Marie Olsen
Antimicrobial Agents and Chemotherapy 2012, 56 (8): 4478-82
22585222
LTX-109 and eight other antimicrobial agents were evaluated against 155 methicillin-resistant Staphylococcus aureus (MRSA) isolates, including strains resistant to vancomycin and strains with decreased susceptibility to daptomycin and linezolid, by microdilution tests to determine MICs. Time-kill assays were performed against representative MRSA, vancomycin-intermediate S. aureus (VISA), and vancomycin-resistant S. aureus (VRSA) isolates. LTX-109 demonstrated a MIC range of 2 to 4 μg/ml and dose-dependent rapid bactericidal activity against S. aureus. This activity was not influenced by resistance to other antistaphylococcal agents.

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