Evaluation of Bacteriophage Cocktails Alone and in Combination with Daptomycin against Daptomycin-Nonsusceptible Enterococcus faecium

Antimicrob Agents Chemother. 2022 Jan 18;66(1):e0162321. doi: 10.1128/AAC.01623-21. Epub 2021 Nov 1.


Enterococcus faecium is a significant multidrug-resistant pathogen. Bacteriophage cocktails are being proposed to complement antibiotic therapy. After a screen of 8 E. faecium strains against 4 phages, 2 phages (113 and 9184) with the broadest host ranges were chosen for further experiments. Transmission electron microscopy, whole-genome sequencing, comparative genome analyses, and time-kill analyses were performed. Daptomycin (DAP) plus the phage cocktail (113 [myophage] and 9184 [siphopage]) showed bactericidal activity in most regimens, while DAP addition prevented phage 9184 resistance against daptomycin-nonsusceptible E. faecium.

Keywords: Enterococcus faecium; bacteriophage cocktails; bacteriophage-antibiotic combinations; bacteriophages; daptomycin.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Anti-Bacterial Agents / pharmacology
  • Bacteriophages* / genetics
  • Daptomycin* / pharmacology
  • Enterococcus faecium* / genetics
  • Microbial Sensitivity Tests


  • Anti-Bacterial Agents
  • Daptomycin