5-log reduction refers to pathogen control. The term is primarily used in the food industry.
For example, if a surface or product has 100,000 bacterial microbes, a 5-log reduction would reduce that number to zero.
In 7-log reduction, 10 million microbes will be killed with the treatment step.
Lately, there has been quite a bit of discussion in the real pet food industry, specifically raw pet food, about log reduction of bacterial pathogens.
To date, there are zero FDA compliance policies in place discussing log reduction in pet food. Nowhere in FSMA is log reduction discussed.
The FDA has certainly made it’s zero tolerance policy on bacterial presence in pet food clear. But there is no formal, written policy regarding log reduction of pathogens.