Hmmm... worms? Well in the wild rabbits would be always on or under the ground. Mites can be a problem for rabbits and applying ivermectin (a tiny drop inside ears or affected area OUTSIDE the body- never ingested or injected) works fast and gets rid of the problem. I raise meat rabbits and they have a fenced area where they play. I have also had rabbit tractors and if you move them as soon as grass/plants are gone they will not have time to dig too much on the dirt. However, left unattended for too many hours or days they will dig and get out.
Maybe someone has had worm problems, but I have researched a lot and have not read about that being a common problem with them... I might be wrong though.
ENJOY YOUR BUNNIES!!