This is a book about doctors, a book about disease fighters. And if even you cannot stand the sight of blood or do not like the smell of iodine, do not rush to close it. Because we are not talking about those doctors who treat you in the hospital or come on call to your home. The people I invite you to meet are doctors of special destiny. They hardly treat. Their job is to prevent the very possibility of disease. On horseback, in a car, or even on foot, an inch by inch, they examine the Earth. And all in order to prevent the infection from spreading through human villages, to stop the infection in the bud.