Document Detail

Efficacy and safety assessment of a novel ultraviolet C device for treating corneal bacterial infections.
MedLine Citation:
PMID:  21105972     Owner:  NLM     Status:  In-Data-Review    
Background:  A prototype solid-state Ultraviolet-C (UVC) LED device may be useful in the treatment of corneal microbial infections, as UVC is commonly used for eradicating bacteria, fungi and viruses in other settings. This study assessed the efficacy of 265 nm UVC from this LED, on four different bacterial strains, and investigated the consequences of corresponding exposures on human corneal epithelial cells in vitro. Methods:  Agar plate lawns of Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa and Streptococcus pyogenes were exposed to a 4.5 mm diameter 265 nm UVC beam at a fixed intensity and distance, for 30, 5, 4, 2 and 1 seconds. Growth inhibition was assessed with a BioRad Gel imager, and the diameter of lucent areas of bacterial inhibition recorded. Human corneal epithelial cells cultured on glass cover-slips were exposed to corresponding doses of UVC from the same device. Live/dead staining was performed and the results quantified. Results:  There was 100% inhibition of growth for all bacteria tested, at all exposure times. A 30-second exposure of human corneal epithelium to UVC gave no statistically significant decrease (P = 0.877) in the ratio of live to dead cells when compared to control cultures. Conclusion:  The results confirmed that a 1 second exposure to germicidal UVC from this LED source was sufficient to inhibit microbial proliferation in the four bacterial strains tested in vitro. The literature suggests UVC at this dose could potentially be beneficial in treating corneal surface infections, without causing significant adverse effects, supported by our findings in human corneal epithelium exposed to UVC.
Simon J Dean; Alex Petty; Simon Swift; Jennifer J McGhee; Anant Sharma; Sunil Shah; Jennifer P Craig
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Clinical & experimental ophthalmology     Volume:  39     ISSN:  1442-9071     ISO Abbreviation:  Clin. Experiment. Ophthalmol.     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-03-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100896531     Medline TA:  Clin Experiment Ophthalmol     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  156-63     Citation Subset:  IM    
Copyright Information:
© 2011 The Authors. Clinical and Experimental Ophthalmology © 2011 Royal Australian and New Zealand College of Ophthalmologists.
University of Auckland, Auckland, New Zealand University of Ulster, Belfast Moorfields Bedford Eye Clinic, Bedford Birmingham and Midlands Eye Centre, Birmingham, UK.
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