Defines the difference between an initial count of microorganisms (bacteria, fungi, viruses) and a final count after the reduction of microorganisms. It is expressed as a reduction factor (RF) in powers of ten or log10 steps. Disinfection measures have the aim of systematically reducing microorganisms.
A reduction factor in the medical field of ≥ log5 means that at least 99.999 % of the microorganisms have been eliminated by disinfection. Thus, a maximum of 1 germ survives out of 100,000 germs.
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