Viruses are the most widespread biological objects on Earth. Technically they are not living, but, as infectious facilities of genetic information, they possess remarkable ability to encroach, propagate and develop in living cages.Synthesizing the large volume of recent researches, Michael Кордингли is beyond our acquaintance with viral infections, to show, as viruses stimulate evolutional changes in the organism of their owners, form global ecosystems and influence on every sphere of life. Кордингли explains how viruses are accountable for creation of many dangerous bacterial, steady to medications diseases. But all not so abysmally. An author shows that we can adapt oneself, limiting the consequences of viral infections.