Document Detail

Optimization of an infected shoe model for the evaluation of an ultraviolet shoe sanitizer device.
MedLine Citation:
PMID:  22826329     Owner:  NLM     Status:  In-Data-Review    
Background: Onychomycosis and tinea pedis (athlete's foot) are infections of the nails and skin caused by pathogenic fungi collectively known as dermatophytes. These infections are difficult to treat, and patients often relapse; it is thought that a patient's footwear becomes infected with these fungal organisms and, thus, is an important reservoir for reinfection. Therefore, it is important to find an effective means for killing the dermatophytes that may have colonized the inner surface of the shoes of patients with superficial fungal infections. In this study, we developed an in vitro model for culturing dermatophytes in footwear and used this model to evaluate the effectiveness of a commercial ultraviolet shoe sanitizer in eradicating the fungal elements residing in shoes. Methods: Leather and athletic shoes (24 pairs) were inoculated with either Trichophyton rubrum or Trichophyton mentagrophytes (10(7) colony-forming units/mL) strains and were placed at 35°C for 4 to 5 days. Next, we compared the ability of swabbing versus scraping to collect microorganisms from infected shoes. Following the optimized method, shoes were infected and were irradiated with one to three cycles of radiation. The inner surfaces of the shoes were swabbed or scraped, and the specimens were cultured for dermatophyte colony-forming units. Results: Leather and canvas shoes were infected to the same extent. Moreover, scraping with a scalpel was overall more effective than was swabbing with a cotton-tipped applicator in recovering viable fungal elements. Irradiation of shoes with one, two, or three cycles resulted in reduction of fungal colonization to the same extent. Conclusions: The developed infected shoe model is useful for assessing the effectiveness of ultraviolet shoe sanitizers. Also, ultraviolet treatment of shoes with a commercial ultraviolet C sanitizing device was effective in reducing the fungal burden in shoes. These findings have implications regarding breaking foot infection cycles.
Mahmoud A Ghannoum; Nancy Isham; Lisa Long
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of the American Podiatric Medical Association     Volume:  102     ISSN:  1930-8264     ISO Abbreviation:  J Am Podiatr Med Assoc     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-07-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8501423     Medline TA:  J Am Podiatr Med Assoc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  309-13     Citation Subset:  IM    
Department of Dermatology, Case Western Reserve University, Cleveland, OH.
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