log10 steps

Microbiological unit of measurement for a product’s performance to reduce microorganisms, expressed as a decimal logarithm. One log10 step equals a reduction by one power of ten. Example: given an initial bacterial count of 1,000,000, the reduction factor of 5 for bactericidal activity thus corresponds to a reduction of 99.999% (5 log steps). In this case, only 10 bacteria would remain.

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