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Title: The effect of wound dressings on growth and exotoxin production by staphylococcus aureus
Author: Buck, Rachael.
Awarding Body: Manchester Metropolitan University
Current Institution: Manchester Metropolitan University
Date of Award: 2003
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Toxic shock syndrome is a rare complication of Staphylococcus aureus infection associated with small burn wounds of under 5 % total body surface area; it is predominantly observed in young children. Environmental factors that occur within a burn wound have been suggested to increase the risk of TSS developing, and wound dressings have been implicated to contribute to this risk. This study examined the effects of 11 wound dressings on the production of TSST-1 by two strains of S. aureus (strains T1 and T4). Initially, the effects of the wound dressings on growth and exotoxin production were assessed using a liquid culture medium, as this was used in other studies. The results indicated that growth was not markedly affected using this system, however there were a number of problems associated with the evaluation. TSST-l production was altered (increased or decreased) depending upon the dressing type, the gaseous environment or the strain of S. aureus used. Other exotoxins did not appear to be greatly affected by any of the dressings. When a semi-solid system was developed to minimise disintegration of the dressings and simulate a more appropriate wound model in terms of support and environment, similar results were observed as to those found in a liquid culture system. A l-layered semi-solid agarose system incubated in 6 % (v/v) carbon dioxide supported optimum TSST-1 production by both test strains in the presence and absence of most wound dressings. Actisorb Plus™ and crepe increased TSST-l production. Levels of TSST-l increased over time and Actisorb Plus™ continued to stimulate increased toxin production. Gamgee, and Biobrane ™previously implicated. in TSS, increased TSST-1 production t.. . I between 48-72 hours. Serine, thiol and metalloproteases were produced by both strains of S. aureus and proportions of each were altered by the presence of dressings. This study showed that some wound dressings may potentially increase the risk of a patient developing TSS, but further studies need to be done in vivo.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Toxic shock syndrome Microbiology Wounds and injuries Toxicology