Reduced ability to detect surface-related biofilm bacteria after antibiotic exposure under in vitro conditions.

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State: Public
Version: author
Serval ID
serval:BIB_26892721002E
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Reduced ability to detect surface-related biofilm bacteria after antibiotic exposure under in vitro conditions.
Journal
Acta orthopaedica
Author(s)
Ravn C., Furustrand Tafin U., Bétrisey B., Overgaard S., Trampuz A.
ISSN
1745-3682 (Electronic)
ISSN-L
1745-3674
Publication state
Published
Issued date
12/2016
Peer-reviewed
Oui
Volume
87
Number
6
Pages
644-650
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
Background and purpose - Antibiotic treatment of patients before specimen collection reduces the ability to detect organisms by culture. We investigated the suppressive effect of antibiotics on the growth of non-adherent, planktonic, and surface-related biofilm bacteria in vitro by using sonication and microcalorimetry methods. Patients and methods - Biofilms of Staphylococcus aureus, S. epidermidis, Escherichia coli, and Propionibacterium acnes were formed on porous glass beads and exposed for 24 h to antibiotic concentrations from 1 to 1,024 times the minimal inhibitory concentration (MIC) of vancomycin, daptomycin, rifampin, flucloxacillin, or ciprofloxacin. The beads were then sonicated to dislodge biofilm, followed by culture and measurement of growth-related heat flow by microcalorimetry of the resulting sonication fluid. Results - Vancomycin did not inhibit the heat flow of staphylococci and P. acnes at concentrations ≤1,024 μg/mL, whereas flucloxacillin at >128 μg/mL inhibited S. aureus. Daptomycin inhibited heat flow of S. aureus, S. epidermidis, and P. acnes at lower concentrations (32-128 times MIC, p < 0.001). Rifampin showed inconsistent results in staphylococci due to random emergence of resistance, which was observed at concentrations ≤1,024 times MIC (i.e. 8 μg/mL). Ciprofloxacin inhibited heat flow of E. coli at ≥4 times MIC (i.e. ≥ 0.06 μg/mL). Interpretation - Whereas time-dependent antibiotics (i.e. vancomycin and flucloxacillin) showed only weak growth suppression, concentration-dependent drugs (i.e. daptomycin and ciprofloxacin) had a strong suppressive effect on bacterial growth and reduced the ability to detect planktonic and biofilm bacteria. Exposure to rifampin rapidly caused emergence of resistance. Our findings indicate that preoperative administration of antibiotics may have heterogeneous effects on the ability to detect biofilm bacteria.

Keywords
Anti-Bacterial Agents/administration & dosage, Anti-Bacterial Agents/therapeutic use, Bacteria/drug effects, Biofilms/drug effects, Cells, Cultured, Dose-Response Relationship, Drug, Humans, Microbial Sensitivity Tests, Prosthesis-Related Infections/drug therapy, Prosthesis-Related Infections/microbiology
Pubmed
Open Access
Yes
Create date
01/11/2016 19:08
Last modification date
20/08/2019 13:05
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