So I'm not saying that's applicable to all meat. I used to like very rare beef after living in France, but I have let that go too.
Some other sources of parasites: sex, walking barefoot, pets especially if they are on the furniture or bed, naturally all kinds of food have parasites, so to enjoy any of the above the parasite treaments have to be repeated. Most of what I've learned about bugs comes from the various pieces of this site and Dr. Larry Clapp's site: http://www.prostate90.com/program/c5ultimate_fast.html