..but a scary fact! In this world people know too little of parasites (for various reasons) and will less likely consider that their health issues can be parasitic in nature. Secondly, the body is being "tricked" by the parasites and can't "see" them, so the chance of detection is even smaller (specially all these ELISA and antibody testing methods). Add these two together and what do we get? A sad human being and a happy parasite.