Mosquito Bites!?

My son goes camping with his father over the weekend and his dad drops him off with about 15 mosquito bites on his body,this happened last weekend as well.I went to the store and bought some cream to subside the itching, but he was up half the nite itching! I'm only suposed to apply the cream once every 4hrs. I am also worried about the west nile virus, although he has no symptoms of that THANK GOD! Is there a good bug repelant I can use on him and Is there a home remedy or an over the counter medicine I can try to ease his itching and take down the swelling ?