Log reduction is a mathematical calculation used to understand the number of living microbes that are killed when using  cold plasma technology or other method of sterilisation. This is especially important to understand how effective a product is to eliminate or reduce the spread of viruses.   For example, a log reduction of 1 corresponds to a 90% reduction in the inactivation of the target microbe. This sees a reduction factor of 10. On the other end of the scale, a log reduction of 6 corresponds to a 99.9999% reduction in the inactivation of the target microbe, which sees a reduction factor of 1,000,000.   This is an important and effective calculation as it explains the relative number of microbes targeted and reduced by the disinfectant and therefore prevents the further spreading of viruses.   The difference between 99.9% and 99.99 log 5 is from 1000 microbes per 1,000,000 down to 10 per 1,000,000, enough to really make a difference to microbial activity and regeneration.