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Applied and Environmental Microbiology, February 2000, p. 874-875, Vol. 66, No. 2
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Observation of Soft Contact Lens Disinfection with Fluorescent Metabolic Stains

J. Gavin,1,2 N. F. Button,2 I. A. Watson-Craik,3 and N. A. Logan1,*

School of Biological and Biomedical Sciences1 and Department of Vision Sciences,2 Glasgow Caledonian University, Glasgow G4 OBA, and Department of Bioscience and Biotechnology, University of Strathclyde, Glasgow G1 1XW,3 United Kingdom

Received 1 June 1999/Accepted 19 November 1999

A rapid fluorescent staining method using a tetrazolium dye and propidium iodide for the in-use assessment of disinfection of Pseudomonas aeruginosa biofilms on soft contact lenses showed that 11 to 13% of cells on lenses remained actively respiring and recoverable by culture methods after 30 min of exposure to 3% hydrogen peroxide.


* Corresponding author. Mailing address: School of Biological and Biomedical Sciences and Department of Vision Sciences, Glasgow Caledonian University, Cowcaddens Rd., Glasgow G4 OBA, United Kingdom. Phone: (44) 141 331 3207. Fax: (44) 141 331 3208. E-mail: N.A.Logan{at}gcal.ac.uk.


Applied and Environmental Microbiology, February 2000, p. 874-875, Vol. 66, No. 2
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.



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