Yes up in the air indeed. Being an "organic guy" into soil life micro organisms and the beauty of mother natures efficient circle of life... and NOT into what the chemical companies and mass production food industry has "fed" us for the last 50 years I too have questions...... Yes it seems the parasites potentially carried by ground worms are real. However I can not seem to find information on what causes the conditions for those parasites to flourish or what their natural predators are. "Bad" bugs exist everywhere, the idea is to have ideal conditions for the "good" bugs, and they take care of the "bad" ones for you. (This is how it is with mother nature, and I am sure mother natures rules applies to no good parasites as well!!!!)
I have trouble believing compost worms raised in proper conditions on a diet of vegetable matter only, with no manure or meat, would be host to parasitic worms..... Yes, I could see if you put parasitic manure in the worm bin the worms could or will be infected.
With that said, I am personally going to proceed with using worm castings on vegetables I grow for the chickens, which I feed container, roots dirt and all to the girls as a treat. Yes a few compost worms are in that soil. No worms are not a significant part of their diet. Yes, I have decided to not vermi compost chicken manure, all chicken manure will be hot composted before it is used in the gardens.
Time will tell I guess of this is enough precaution. Taking some precaution, at least common sense precaution makes sense to me. IF it is not enough precaution I would be shocked and truly bummed, because compost worms are a key component in our organic way of life.
---Yes I love my worms, just not as much as my chickens.. The worms do not fly up on my shoulder just to say hi.....Nor have the kids named the worms like they have the chickens......
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ON