We don’t like to think about it so much, but a lot of us are walking around with a gut full of parasites. We’d rather like to believe that it is a problem for people in the third world – or for those travelers returning with La Tourista from Mexico, Africa or India. Unfortunately, that isn’t necessarily the case. We have plenty of similar organisms right here – and plenty of opportunities to become infected with them. The fact is that a lot of people who haven’t ventured past our borders are experiencing compromised health because, unbeknownst to them, they have a chronic parasitic infestation.