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Title

Immuno-detection of Staphylococcus aureus biofilm on a cochlear implant

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Published in Infection. 2009, vol. 37, no. 5, p. 450-454
Collection Open Access - Licence nationale Springer
Abstract CASE PRESENTATION: A 46-year-old man suffering from progressive deafness since childhood received a Clarion 90 K cochlear implant with the HiRes preformed electrode in his left ear in October 2006. A persistent Staphylococcus aureus infection failed to be treated with corticoids, amoxicillin/ clavulanate, ciprofloxaxin, and rifampin. The processor was removed on July 2007. INTERVENTIONS: The removed cochlear implant processor was treated with different reagents, with the aim of detecting a S. aureus and S. aureus biofilm: (1) fluorescein-coupled Fc of anti-human serum, (2) polyclonal anti-polysaccharide intercellular adhesion antibodies coupled to Alexa Fluor 568 goat anti-rabbit immunoglobulin (Ig)G, (3) crystal violet, (4) methylene blue, (5) acridine orange, (6) Gram stain, and (7) live/dead fluorescent stain. RESULTS: S. aureus and the major constituent of the S. aureus biofilm, the polysaccharide intercellular adhesion, were detected on the surface of the implant. S. aureus was isolated after a simple contact between the implant and a solid growth medium. The ability of the isolated S. aureus strain to produce biofilm in vitro was confirmed. INTERPRETATION: S. aureus biofilm was documented on the implant. Initial bacterial colonization could be related to the pocket of the removable magnet. Colonies of S. aureus without biofilm were found attached to the electrode wire. CONCLUSION: We report one case of a S. aureus biofilm infection documented on a cochlear implant, as assessed by immuno-microscopy. The biofilm was likely responsible for the persistent infection which manifested for many months after the implant surgery and could explain the unusual bacterial phenotypic resistance against administered antimicrobial agents.
Keywords AnimalsAntibodies, Bacterial/diagnostic useBacteriological Techniques/*methods*BiofilmsCochlear Implants/*microbiologyHumansImmunoassay/methodsMaleMicroscopy/methodsMiddle AgedStaining and Labeling/methodsStaphylococcal Infections/*microbiologyStaphylococcus aureus/immunology/*isolation & purification
Identifiers
PMID: 19280117
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Structures
Research groups Implant, fonction et affections vestibulaires (268)
Analyse génomique et fonctionnelle du staphylocoque doré (604)
Acquisition et expression de facteurs de virulence chez Staphylococcus aureus (86)
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(ISO format)
KOS, Maria Izabel et al. Immuno-detection of Staphylococcus aureus biofilm on a cochlear implant. In: Infection, 2009, vol. 37, n° 5, p. 450-454. https://archive-ouverte.unige.ch/unige:19894

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Deposited on : 2012-04-23

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