Drug – bio-affecting and body treating compositions – In vivo diagnosis or in vivo testing – Diagnostic or test agent produces in vivo fluorescence
Reexamination Certificate
2005-12-15
2010-06-01
Hobbs, Lisa J (Department: 1657)
Drug, bio-affecting and body treating compositions
In vivo diagnosis or in vivo testing
Diagnostic or test agent produces in vivo fluorescence
C435S029000, C435S031000, C435S034000
Reexamination Certificate
active
07727513
ABSTRACT:
A method for rapidly detecting infectious conjunctivitis in a host is provided. The method includes contacting an ocular test sample with a chromogen (e.g., Reichardt's dye) that exhibits a color change in the presence of a microbe. The present inventors have discovered that the extent of the color change may vary depending on whether the microbe is a bacteria or virus. Without intending to be limited by theory, the present inventors believe that the chromogen interacts with the peptidoglycan-based cell wall structure of bacteria to induce a color change that is even more apparent at infectious levels. It is believed that this interaction occurs to a much greater extent in bacteria than in viruses. Accordingly, although the chromogen may still undergo a color change in the presence of the viruses, it is typically to a much lesser extent. In this manner, the degree of color change of the chromogen may be used in the present invention as a mechanism for differentiating between viral and bacterial conjunctivitis.
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Lye Jason
MacDonald John Gavin
Martin Stephanie M.
Dority & Manning P.A.
Hobbs Lisa J
Kimberly--Clark Worldwide, Inc.
Weber Jon P
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