We attended a small church years ago with the family of a young boy who had a severe peanut allergy. This family lived in a state of constant concern. They could not eat at restaurants, they shared pitchins with us with extreme caution. We were all on high alert as he had experienced repeated anaphylactic reactions to peanuts. They kept an epi-pen on hand everywhere they went. The vigilant parents felt even trace amounts on the lip or skin or even the scent of the food could trigger a reaction. It was very hard on their child and family.
Back then we had no idea why this happened….