I can see how they can cause all kinds of immune system problems. I wouldn't be surprised if they are reponsible for most autoimmune disorders. From what I read the parasites try to mimic your tissues and they effect your immune response. Your body probably knows something isn't quite right with that tissue so it attacks it and because it is so similar to your own tissues your immune system attacks your own body.Makes sense to me. I never could buy that your body just starts attacking itself for no reason.