DS (age 14, allergy to peanuts) had a reaction last night during a boy scout camping trip. It turned out fine - he used his epipen right away, and then was taken to the nearest emergency room. But I figure it might help others to hear our story.
He's been camping many times with his troop with no problems, but this weekend was an induction event for his entrance to the Order of the Arrow, so there were a lot of different scouts from different troops. Part of the event is a semi-fast (the boys only get a slice of bread and an egg for breakfast, and a half a sandwich and an apply for lunch), so they had a big appetite come dinner. DS, knowing hunger could make him careless, doublechecked all the labels, even the foods he's had before with no problem, including the Chips Ahoy cookies.
What he didn't realize was they had bought more than one type of Chips Ahoy cookies. When he got a second cookie, it was a new variety that came from this package, which looked similar to the regular package.
http://www.target.com/p/chips-ahoy-reese-s-peanut-butter-cookies-9-5oz/-/A-12945518He knew right away that something was wrong - it tasted horrible, his mouth started burning, and he was having trouble swallowing. He used his epipen right away one of the leaders called me. I told them to take him to the emergency room, and drove out to meet them (about an hour away). No problems at all at the emergency room - they definitely had dealt with this before.
All in all, it could've been much worse.