My son has a tree-nut allergy (he can eat peanuts, though). In his school, they had a party in the auditorium one evening. The next day, he was sitting on the floor for assembly, and had an allergic reaction--to the floor. I was the school secretary, so he was brought straight into my office. All he did was wipe his eye with his finger. From what we figure, someone must have dropped a nut, part of granola bar, etc on the floor at the party. Although the floor had been dry-and-wet-mopped, some fragment of the nut remained. He'd been sitting with his hands on the floor, wiped his eye, transferred the allergen from the floor to his eye, and half his face swelled up like a balloon. Fortunately, an anti-histimine took care of it; no epipen required. He's never actually had to use his epi; we just throw two of them out every year. (He's 20 now)
And speaking of epipens: when they first came out in England, Justin was about five, I guess. Anyway, the doctor didn't want to prescribe one for us because of the expense. (UK doctors offices get charged for the NHS prescriptions they write. At that time an epi was about 100 pounds.) She asked how far we lived from the hospital. When I replied "six miles", she said there was no need for an epipen, we could make it to the hospital in time! I pointed out that although it's six miles, part of that was the Catford one-way system, which can take 30 minutes to negotiate. Still wouldn't give me one. I really had to put up a fight.