I think they get spots on the liver.
That's what we always look for.
Lotta rabbits have spots on the liver from liver flukes which are harmless. You'll usually find skeins of jellified eggs amongst the intestines if it's infected with flukes. Lotsa worry about tularemia considering it too is harmless so long as you cook the meat thoroughly and don't have any open wounds on the hands or wear latex gloves when dressing. Geeze, you'd think with all the supposedly great, knowledgeable, experienced "outdoorsmen" on these forums more would know this basic stuff.