Today, there are probably no people left who have not heard about the mortal danger parasites pose to the human body. The book examines in detail and in an accessible way almost all issues related to this topic: the parasites themselves are described in all their diversity and their impact on the body, and a simple and effective program for combating them is proposed. The undoubted advantages of the book, which distinguish it favorably from its analogues, include a simple figurative structure of presentation and a large number of examples. As a result, the book not only provides the information everyone needs, but is also easy to read.