Antibacterial Efficacy Testing of a Bioelectric Wound Dressing Against Clinical Wound Pathogens
Hosan Kim 1, Inder Makin 3, Jeff Skiba 3, Amy Ho 3, Greggory Housler 4, Alexander Stojadinovic 2, 5, Mina Izadjoo 1, *
1 Diagnostics and Translational Research Center, Henry M Jackson Foundation for the Advancement of Military Medicine, Gaithersburg, MD, USA
2 Combat Wound Initiative Program, Bethesda, MD, USA
3 Vomaris, Inc. Vomaris Innovations Inc., Chandler, AZ, USA
4 United States Army Medical Materiel Agency (USAMMA), Fort Detrick, MD, USA
5 Walter Reed National Military Medical Center, Bethesda, MD, USA
Silver-based wound dressings have been developed for the control of bioburden in wounds. However, the popularity and extensive use of silver-based dressings has been associated with emerging microbial resistances to silver. In this study we examined in vitro antibacterial efficacy of a bioelectric dressing containing silver and zinc against various wound pathogens. Antibiotic-sensitive clinical wound isolates showed a 100% reduction in bacterial growth, except that Enterococcus faecalis isolate was shown to survive with a bacterial log10 reduction rate of less than 102 CFU. We also investigated antibacterial efficacy against the extended spectrum β-lactamase (ESBL) bacteria, multidrug-resistant (MDR) bacteria, and methicillin-resistant Staphylococcus aureus (MRSA). The bioelectric dressing was effective in killing wound pathogens including ESBL, MDR, and MRSA in vitro. Furthermore, based on the primary results against E. faecalis, we carried out extensive studies against several nosocomial Enterococcus species including vancomycin-resistant species. Overall, the vancomycin-sensitive or -resistant Enterococcus species were resistant to this dressing at up to 48 h, except for the vancomycin-resistant Enterococcus raffinosus isolate only showing a 100% bacterial reduction at 48 h, but not at 24 h. The results demonstrated the effective bactericidal activity of a bioelectric dressing against antibiotic-sensitive and MDR strains, but Enterococcus species are bacteriostatic.
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