I wouldn't try it. I remember reading an article by a doctor from the Mayo Clinic who criticized the Iowa researchers for calling worm therapy "safe." For an academic article, the language was quite strong.
And, speaking from personal experience, I used to be a patient of one of the doctors involved in "worm therapy"--Robert W Summers. (Granted, he's not the one who came up with the idea; he just happens to be at the university where the guy who came up with the idea used to be at...)
In my own experience, Robert Summers, a proponent of worm therapy, one who claims it's safe, denied common side effects of prednisone and Imuran completely, even when I was experiencing them--and because he refused to acknowledge and, as a result, refused to treat the side effects, the damage is permanent--so if he calls something safe, I am skeptical. It doesn't mean they're dangerous, of course; but this just isn't the sort of person you can trust. Just because he says worms are safe, it doesn't mean they are.
When I was his patient, he even denied that Imuran can cause certain types of cancer, which is pretty widely acknowledge--even the Mayo Clinic acknowledges it. So if a guy like this is evaluating the safety of using worms to treat CD, that is depressing indeed.