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CALL FOR ABSTRACTS ABSTRACT DEADLINE 15 JANUARY 2009
EWMA2008 Presented at the 18 th Conference of the European Wound Management Association, 14-16 May 2008, Lisbon, Portugal A Laboratory Survey of the Antimicrobial Properties of Honey-Containing Dressings Abstract Background: Many new sterile honey impregnated wound dressings have recently become available for clinical use. These dressings contain different honey formulations, and therefore differing antibacterial efficacy. Aim: To investigate the antimicrobial properties of six licensed wound dressings containing honey. Method: 2 x 2 cm samples of each of six honey containing dressings were applied to the surface of bioassay plates seeded with overnight broth cultures of bacteria. The organisms tested: Staphylococcus aureus NCTC 6571, EMRSA-15 NCTC 13142 and a clinical isolate of Pseudomonas aeruginosa. The plates were incubated at 37°C for 24 hours. Zones of inhibition were measured and corrected zone sizes calculated, the plates were prepared in duplicate on three separate occasions. Results: Two dressings gave negligible zones of inhibition with each of the three test organisms. The remaining four dressings gave distinct zones of inhibition with all organisms, staphylococci were found to be more sensitive to honey than pseudomonads. Conclusion: The dressings that caused inhibition of the test organisms all contained manuka honey at relatively high concentrations. The dressings that did not give rise to zones of inhibition contained other honeys at lower concentrations. The type and concentration of honey in wound dressings influences efficacy in vitro. INTRODUCTION Honey has been used since ancient times as not only a food source but also a medicinal product and was used routinely in British hospitals up until the 1970s, however with the advent of antibiotics use of honey was reduced and eventually lost from mainstream medicine. Since the advent of antibiotic resistance there has been a growing need for wound management products that can act as an alternative to antibiotics 1 . Honey has several advantages as a wound therapy product, showing broad spectrum antimicrobial activity against bacteria, protozoa and some viruses 2-6 . It has also been reported to improve wound healing, stimulate wound healing factors, remove sloughy tissue and reduce wound odour 7- 9 . There are several reasons for the antimicrobial action. Honey has a high sugar content leading to high osmolarity in the wound, removing water available for bacteria, and it also has a low pH unsuitable for the growth of most wound infecting pathogens. Some honeys generate hydrogen peroxide on dilution in a wound and others contain phytochemicals which may account for their antimicrobial activity 10 . Honey wound products have now been on the market in the UK since 2004 and several brands are available. Not all of the dressings produced are the same; they can be made of differing materials: gauze, tulle, mesh, polyethylenevinylacetate, alginate or hydrogel. They contain different types of honey such as Leptospermum honeys (manuka and jelly bush), others use buckwheat or unspecified honeys in their dressings. Some of the dressings also contain formulations adding components such as aloe vera and cod liver oil. These differing products need comparative analysis to ensure that informed decisions can be made when selecting them for clinical practice. METHODS Test Organisms n Staphylococcus aureus NCTC 6571 (Oxford staph) n Epidemic methicillin-resistant Staphylococcus aureus (EMRSA-15) NCTC 13142 n Pseudomonas aeruginosa (clinical isolate) Science, Practice and Education � Rowena Jenkins Neil Burton, Rose Cooper, University of Wales Institute Cardiff Corresponding author: R. E. Jenkins, Centre for Biomedical Sciences, Cardiff School of Health Sciences, University of Wales Institute Cardiff, Western Avenue, Cardiff CF5 2YB UK r.jenkins7@uwic.ac.uk EWMA Journal 2008 vol 8 no 3 11
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