Parasites and symbionts are something from the world of science fiction. When we see these creatures in close-up, they make us fearful and disgusted. When we learn that worms or invertebrates are capable of inhabiting us, we panic. In fact, everything is regulated and subject to the will of man. Parasites, of course, act as invaders of our body, but the human body’s defense system is also very complex and inventive. This book is a guide to the main “enemies”, descriptions of their strengths and weaknesses, stories about the possibilities of invasion and methods of defense. Immerse yourself in the fascinating wild, wild world of our body, accept it or fight!