A cookery related article I want to refer to mentions a "7 log10 relative reduction of salmonella". A few related sources suggest this evaluates to 10,000,000, although I would have imagined that 107 is the usual way of expressing this.
I initially thought that I should interpret this as log10(7) but that doesn't seem right given that an 85% reduction in salmonella can hardly be considered safe.
If the first interpretation is correct, could someone tell me why it might have been expressed this way, rather than as a power of 10?