As noted, this was a precautionary recall that was issued after one test out of a number of tests performed on the product, came back with a positive result. From the FDA release from the company: "All products shipped to the marketplace tested negative for salmonella. However, because additional product tested positive for salmonella under AMPI’s routine test and hold procedures, the company is recalling product as a precautionary measure." Further, "AMPI has ceased production at its Blair, Wis., dry whey plant, is currently investigating the cause for the positive samples, and will take all necessary remedial actions."
So if Salmonella present in the ingredient, based on the amount of testing said to have been completed, we would say that Salmonella would be at very low levels in the ingredient, and once processed (baking), there would be essentially no risk of it being present in finished product.
This shows the implications of one bad test even though many negative results may be found beforehand. It also shows the impact of an ingredients on products even though those products where processed in a way to eliminate the potential hazard.
https://www.fda.gov/Safety/Recalls/ucm614759.htm
AMPI Recalls Limited Amount of Dry Whey Powder Because of Possible Health Risk
For Immediate Release
July 25, 2018
https://www.fda.gov/Safety/Recalls/ucm614759.htm
AMPI Recalls Limited Amount of Dry Whey Powder Because of Possible Health Risk
For Immediate Release
July 25, 2018