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Infect Dis (Lond). 2017 May;49(5):410-416. doi: 10.1080/23744235.2016.1277587. Epub 2017 Jan 24.

A combination of ceftaroline and daptomycin has synergistic and bactericidal activity in vitro against daptomycin nonsusceptible methicillin-resistant Staphylococcus aureus (MRSA).

Author information

1
a Laboratory for Antimicrobial Pharmacodynamics, Department of Pharmacy Practice, University at Buffalo School of Pharmacy and Pharmaceutical Sciences , Buffalo , NY , USA.
2
b Infectious Diseases Department, Veterans Affairs Western New York Healthcare System , Buffalo , NY , USA.

Abstract

There is an urgent need to optimize therapeutic options in patients with methicillin-resistant Staphylococcus aureus (MRSA) bacteremia who have failed conventional therapy. Two clinical isolates were obtained from a 68-year-old male with persistent MRSA bacteremia before and after the development of daptomycin nonsusceptibility. The pharmacodynamic activity of monotherapies and combinations of ceftaroline, daptomycin, cefoxitin, nafcillin and vancomycin were evaluated in time-kill experiments versus 108 CFU/mL of the pre- and post-daptomycin nonsusceptible MRSA isolates. Cefoxitin, nafcillin and vancomycin alone or in combination with ceftaroline failed to generate prolonged bactericidal activity against the post-daptomycin nonsusceptible isolate whereas a ceftaroline-daptomycin combination resulted in 6, 24 and 48 h log10(CFU/mL) reductions of 3.90, 4.40 and 6.32. Population analysis profiles revealed a daptomycin heteroresistant subpopulation of the pre-daptomycin nonsusceptible MRSA isolate that expanded by >10,000× on daptomycin agar containing 2-16 mg/L in the post-daptomycin nonsusceptible isolate. Daptomycin and ceftaroline combinations may be promising against persistent MRSA bacteremia.

KEYWORDS:

Daptomycin; MRSA; bacteremia; ceftaroline; daptomycin nonsusceptible

PMID:
28116950
DOI:
10.1080/23744235.2016.1277587
[Indexed for MEDLINE]

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