Novel rat model of methicillin-resistant staphylococcus aureus-infected silicone breast implants: A study of biofilm pathogenesis

Ehud Arad, Shiri Navon-Venezia, Eyal Gur, Boris Kuzmenko, Rivka Glick, Daphna Frenkiel-Krispin, Eyal Kramer, Yehuda Carmeli, Yoav Barnea

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


BACKGROUND: Clinical infection of breast implants occurs in 7 to 24 percent of breast reconstructions. It may persist over time in the form of biofilm without overt manifestation and is extremely difficult to eradicate. The authorsÊ aim was to establish a novel model for biofilm infection of silicone breast implants in rats. METHODS: Fifty-six rats underwent implantation of miniature silicone breast implants and/or methicillin-resistant Staphylococcus aureus (MRSA) bacteria. Group A received implants covered with MRSA biofilm. Group B received implants and free planktonic MRSA. Group C received free planktonic MRSA without implants. A control group received sterile implants without MRSA. Each group was divided to receive either saline or vancomycin injections between days 4 and 11. Clinical evaluation, bacterial counts, and scanning electron microscopy were performed. RESULTS: The mortality rate in group B (implants infected with free planktonic MRSA) was significantly higher than that in all other groups [37 percent versus groups A and D (0 percent) and group C (7 percent)]. Treatment with vancomycin lowered temperature in groups B and C (p < 0.05) and improved wound healing in group B (p < 0.01). Vancomycin treatment reduced wound bacterial counts in free planktonic MRSA groups B and C but had no significant effect on biofilm MRSA-infected group A. CONCLUSIONS: The model successfully induced persistent breast implant infection. Free planktonic MRSA produced in situ biofilm on silicone implants. Biofilm infection has milder manifestations than free planktonic MRSA infection, which has higher rates of systemic infections and death when compared with either isolated biofilm infection or free planktonic MRSA infection without implant. Vancomycin has limited effect against mature biofilm.

Original languageEnglish
Pages (from-to)205-214
Number of pages10
JournalPlastic and Reconstructive Surgery
Issue number2
StatePublished - Feb 2013
Externally publishedYes


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