When your throat burns or your ear hurts, it means that malicious tiny creatures have entered your body and want to run rampant there and cause a serious illness. Fortunately, we have miniature helpers in our bodies who wage a fierce battle with bacteria and viruses for our health. What happens in the body at that moment, how the so-called good guys and bad guys fight with each other and what we can do to make things go well, children will learn in a funny and exciting story by a well-known Czech author of children's books. Intended for children from 7 years old.