I have spoken to wildlife biologist on this question. This is what they have told me, and I have eaten a number of summer rabbits to no ill effect.
Use rubber gloves always when cleaning rabbits, regardless of time of the year, inspect them for abnormal looking sores on the meat, or liver.
Throughly cook the rabbit in the way you prefer, and you will have no problem. Regarding Jacks, eat the young ones, and crock pot, or pressure cook the old ones. No jack will hold a candle to a cottontail, but I have enjoyed both. I wish I were going with you....Good Luck, Good Shooting.