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Staphylococcus aureus biofilm as a target for single or repeated doses of oxacillin, vancomycin, linezolid and/or lysostaphin

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Abstract

Due to high resistance, standard chemotherapy of biofilm-associated staphylococcal infections is ineffective and a number of alternative approaches to antimicrobial treatment have been proposed. Minimum inhibitory concentration (MIC) and biofilm inhibitory concentration (BIC) of oxacillin (Oxa), vancomycin (Van), linezolid (Lzd) and lysostaphin (Lss) as well as the possible synergistic effect of the antibiotics and lysostaphin were determined. The Lss susceptibility ofStaphylococcus aureus planktonic and biofilm cultures varied and was strain-dependent. The synergistic effect of sub-BICLss+Oxa was observed for methicillin-sensitiveS. aureus (Ms Sa) and methicillin-resistantS. aureus (Mr Sa), but not for heterogeneously vancomycin-resistantS. aureus (Vh Sa) biofilm. Van with sub-BICLss was effective against Ms Sa and Mr Sa biofilm, when applied in three subsequent doses. Only sub-BICLss+Lzd combination, given as three cycles therapy, was effective in disruption of all 3 (Ms Sa, Mr Sa, Vh Sa) biofilms.

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Abbreviations

BIC:

biofilm inhibitory concentration

Mr Sa :

methicillin-resistantS. aureus

FITC:

fluorescein isothiocyanate

MTT:

3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide

Vh Sa :

S. aureus heterogeneously resistant to vancomycin

Lss:

lysostaphin

MIC:

minimal inhibitory concentration

Ms Sa :

methicillin-sensitiveS. aureus

Lzd:

linezolid

Oxa:

oxacillin

Van:

vancomycin

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This study was supported by the grant 2PO5A 149 29 from thePolish Scientific Research Committee.

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Walencka, E., Sadowska, B., Róžalska, S. et al. Staphylococcus aureus biofilm as a target for single or repeated doses of oxacillin, vancomycin, linezolid and/or lysostaphin. Folia Microbiol 51, 381–386 (2006). https://doi.org/10.1007/BF02931580

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  • DOI: https://doi.org/10.1007/BF02931580

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