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May 2001


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Anger_Claude <[log in to unmask]>
Reply To:
The Pharmaceutical Microbiology Mail List <[log in to unmask]>
Tue, 1 May 2001 07:58:15 -0700
text/plain (62 lines)
I was on the USP subcommittee to adopt some kind of BI antimicrobial
resistance indicator test for the challenge organisms. Also, I previously
worked at Purex and performed the "phenol coefficient tests" which are
absolutely terrible and are in no way an indicator of the resistance of the
challenge cells. I kept data from "experiments discarded because the phenol
coefficient value failed" and showed the company that the antimicrobial use
dilution test data did not change with the variance in the phenol
coefficient value - and so there you have it. Please discard any thoughts of
employing the phenol coefficient test on antimicrobial challenge test
organisms. What you are trying to do is indeed a difficult task. I sincerely
do not believe it is a relevant test method to pursue because it would
require the use of a battery of different standardized antimicrobial
solutions in order to get useful data. Also, because our challenge inocula
are a diverse population of cells in different states of metabolism and
reproduction I think it would be difficult to achieve reproducible
antimicrobial resistance data on a day to day basis.

Claude Anger
Pharmaceutical Microbiology
(714) 246-4533
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 -----Original Message-----
From:   Anthony Cundell [mailto:[log in to unmask]]
Sent:   Monday, April 30, 2001 1:54 PM
To:     [log in to unmask]
Subject:        [PMFLIST] Alternate to the Phenol Resistance Test

The EPA is actively reviewing the elimination or modification of the Phenol
Resistance Test as a requirement for the registration of disinfectants.

The purpose of the test is control or verify the resistance of test

The USP attempted to add such as test to the Antimicrobial Effectiveness
test as a method of controlling the inherent variability of the test.

Does anyone have an opinion as to the direction we should go with this

Tony Cundell
Wyeth-Ayerst Pharmaceuticals

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