An in vitro model of chronic wound biofilms to test wound dressings and assess antimicrobial susceptibilities

Hill, Katja E. ORCID: https://orcid.org/0000-0002-8590-0117, Malic, Sladjana, McKee, Ruth, Rennison, Tracy, Harding, Keith Gordon, Williams, David Wynne ORCID: https://orcid.org/0000-0002-7351-5131 and Thomas, David William ORCID: https://orcid.org/0000-0001-7319-5820 2010. An in vitro model of chronic wound biofilms to test wound dressings and assess antimicrobial susceptibilities. Journal of Antimicrobial Chemotherapy 65 (6) , pp. 1195-1206. 10.1093/jac/dkq105

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Abstract

The targeted disruption of biofilms in chronic wounds is an important treatment strategy and the subject of intense research. In the present study, an in vitro model of chronic wound biofilms was developed to assess the efficacy of antimicrobial treatments for use in the wound environment. Using chronic wound isolates, assays of bacterial coaggregation established that aerobic and anaerobic wound bacteria were able to coaggregate and form biofilms. A constant depth film fermenter (CDFF) was used to develop wound biofilms in vitro, which were analysed using light microscopy and scanning electron microscopy. The susceptibility of bacteria within these biofilms was examined in response to the most frequently prescribed 'chronic wound' antibiotics and a series of iodine- and silver-containing commercial antimicrobial products and lactoferrin. Defined biofilms were rapidly established within 1-2 days. Antibiotic treatment demonstrated that mixed Pseudomonas and Staphylococcus biofilms were not affected by ciprofloxacin (5 mg/L) or flucloxacillin (15 mg/L), even at concentrations equivalent to twice the observed peak serum levels. The results contrasted with the ability of povidone-iodine (1%) to disrupt the wound biofilm; an effect that was particularly pronounced in the dressing testing where iodine-based dressings completely disrupted established 7 day biofilms. In contrast, only two of six silver-containing dressings exhibited any effect on 3 day biofilms, with no effect on 7 day biofilms. This wound model emphasizes the potential role of the biofilm phenotype in the observed resistance to antibiotic therapies that may occur in chronic wounds in vivo.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Dentistry Systems Immunity Research Institute (SIURI)
Subjects:	Q Science > QR Microbiology R Medicine > RM Therapeutics. Pharmacology
Uncontrolled Keywords:	chronic venous leg ulcer; constant depth film fermenter; antibiotic resistance; biocide resistance; coaggregation lactoferrin
Publisher:	Oxford University Press
ISSN:	0305-7453
Last Modified:	18 Oct 2022 13:55
URI:	https://orca.cardiff.ac.uk/id/eprint/15886

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