ok, I stand chastised if my Jif isn't pure ground peanuts. (Gosh, hope the pure ground peanut spread isn't used on store bought bread or crackers ;) .) Maybe the problem with the crumbling cookies is the difference between the pure ground peanuts vs the store brand varieties. As I am not a professional cook, I've not experienced the pails of peanut goo (?) you might find in a commercial kitchen.
Samonella can be dangerous, especially to children and immune-compromised folks. Symptons are diarrhea, fever, cramps, headache, nausea, loss of appetite and vomiting according to the CDC. Contaminated foods are commonly raw pountry, eggs, beef and unwashed fruit and vegies. Cross contamination can also be an issue - - for example a counter exposed to raw meat.
Better to be checked out then to suffer the results of contaminated food. Hope all is well.