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Biocide susceptibility of the Burkholderia cepacia complex
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Rose, Helen, Baldwin, Adam, Dowson, Christopher G. and Mahenthiralingam, Eshwar. (2009) Biocide susceptibility of the Burkholderia cepacia complex. Journal of Antimicrobial Chemotherapy, Vol.63 (No.3). pp. 502-510. ISSN 0305-7453
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Official URL: http://dx.doi.org/10.1093/jac/dkn540
Abstract
The Burkholderia cepacia complex (Bcc) species are important opportunistic pathogens with intrinsic antibiotic resistance. They are also well known as contaminants of disinfectants, yet their biocide susceptibility has not been studied in detail. We investigated Bcc biocide susceptibility and correlated it to their taxonomy, antibiotic susceptibility and ability to form biofilms.
Genetically distinct Bcc strains belonging to 12 of the defined species were examined. Biocide susceptibility was assessed by (i) broth dilution MIC assays, (ii) agar growth-based MBC screens and (iii) suspension tests. Antibiotic MIC was determined by Etest((R)) strips, and the ability to form biofilms was examined in a 96-well plate assay.
Biocide susceptibility varied across the Bcc complex with high MIC recorded for chlorhexidine (> 100 mg/L), cetylpyridinium chloride (> 200 mg/L), triclosan (> 500 mg/L), benzalkonium chloride (> 400 mg/L) and povidone (> 50 000 mg/L). Species-dependent differences were apparent only for cetylpyridinium chloride. There was no correlation between biocide susceptibility and (i) antibiotic susceptibility or (ii) the ability to form biofilms. Biocide MBC was considerably higher than the MIC (chlorhexidine, 6-fold greater; cetylpyridinium chloride, 20-fold greater). Cystic fibrosis outbreak strains (Burkholderia multivorans Glasgow strain and Burkholderia cenocepacia ET12) possessed elevated chlorhexidine resistance, and Bcc bacteria were also shown to remain viable in current commercial biocide formulations.
Bcc bacteria are resistant to a wide range of biocides and further representatives of this group should be included as reference strains in the development of new anti-infectives and commercial formulations.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QR Microbiology > QR355 Virology Q Science > QR Microbiology R Medicine > RS Pharmacy and materia medica |
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| Divisions: | Faculty of Science > Life Sciences (2010- ) > Biological Sciences ( -2010) | ||||
| Journal or Publication Title: | Journal of Antimicrobial Chemotherapy | ||||
| Publisher: | Oxford University Press | ||||
| ISSN: | 0305-7453 | ||||
| Official Date: | March 2009 | ||||
| Dates: |
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| Volume: | Vol.63 | ||||
| Number: | No.3 | ||||
| Number of Pages: | 9 | ||||
| Page Range: | pp. 502-510 | ||||
| Identifier: | 10.1093/jac/dkn540 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | CF Trust, Big Lottery, Wellcome Trust | ||||
| Grant number: | MbC003, PJ535, 72853 | ||||
| URI: | http://wrap.warwick.ac.uk/id/eprint/28470 |
Data sourced from Thomson Reuters' Web of Knowledge
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