What is a 6-log kill rate?

Updated: Jul 23, 2020

A log kill or log-reduction is a measure of how thoroughly a decontamination process reduces the concentration of a contaminant. The term “log reduction” indicates a 10-fold reduction(one decimal), which means that with every level, the number of bacteria or virus is reduced by 90%.

What does this really mean? If there is 1 million bacteria on a surface, a disinfectant with a 2-log reduction will leave behind 10,000 bacteria while a disinfectant with a 6-log reduction will kill all but 1 cell.

1-log reduction = kills 90% of bacteria leaving 100,000 alive

2-log reduction = kills 99% of bacteria leaving 10,000 alive

3-log reduction = kills 99.9% of bacteria leaving 1,000 alive

4-log reduction = kills 99.99% of bacteria leaving 100 alive

5-log reduction = kills 99.999% of bacteria leaving 10 alive

6-log reduction = kills 99.9999% of bacteria leaving 1 cell of alive

The majority of EPA registered disinfectants have a 3 or 4-log reduction and take anywhere between 5-30 minutes to work. SteraMist is a hospital grade disinfectant that has a 6-log reduction and kills 99.9999% of bacteria and viruses within seconds of application.

The Coronavirus is a highly infectious virus that you don't want to take a chance on. Prevent further contamination and outbreaks by choosing a disinfection service provider that offers a 6-log disinfectant. If you have an emergency disinfection need or are looking for a routine disinfection service in Austin, TX, give us a call at 512.452.2701 or email us at info@atxesl.com.





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