WORMING WITH FOOD GRADE DIATOMACEOUS EARTH All humans have parasites. There are about 3,200 varieties of parasites. We might not think we do, but science has proven we do. All living things carry at least one parasite, but humans carry a whole lot more. These small organisms live off us. Yes we are their host. They do nothing good for us, only harm! You will find all the same worms dogs have, we also have. Parasites may enter via the mouth, the skin and the bottom of the feet