I'm not a camp nurse, but I'm a school nurse who has chaperoned many, many middle school groups on tours. You'd be surprised what can happen. The majority of my day is fixing boo-boos, runny noses, tummy aches and passing ADHD meds. I have the occasional asthma attack, head injury, sprain or fracture, and injuries from fights(usually boys, but I have had a few girls beat the snot out of each other.)
I think the worst health problems I ever had were 1) a child with an anaphylactic reaction to the HORSE she was riding and no EMS available.
2) the kid who broke her nose in teh pool when she swam into another kid's outstretched ankle. It looked like a hog-killing in the pool
and 3) the time *I* had an anaphylactic reaction in the airport while our tour was waiting to board. They thought I was gonna die (me too!) and by the time the EMTs got there I couldn't tell them who I was or where I lived or what I took. Very scary!