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EFHSS Questions and Answers - Question Q00454

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EFHSS - Questions & Answers - Steam Sterilization - Q00454
log reduction 		Follow Up
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From: (Romania)   Date: 7 May 2004, 12:41 [GMT]
Subject: log reduction

Hello,
I work as microbiologiste in Romania and I need help for an autoclave report validation. Please, if you want to explain me how to interpret a log reduction in steam sterilization.

Thanks and
Best regards,
Dana
From:    Date: 7 May 2004, 17:50 [GMT]
Subject: Re: log reduction

Dear Dana

Imagine that the microorganisms are like a bunch of grapes. A steam wave comes and kill 90% and they fall. 10% are left. A second steam wave kills again 90% of the 10%. (1% is left). The 3rd wave will kill 90% of the 1%. and so on. A change (reduction) of 1/10 is defined "log" (logaritm).
I hope you understood my explanation.
miki

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