Over the centuries evolved threat to human health. Numerous epidemics decimated the population on the one hand, on the other hand are often a stimulus to the advancement of knowledge. This condition occurred in the discoveries of the century. Now, with the advancement of molecular and clinical base spawn new opportunities es in preventive and treatment procedures. But we cannot ignore the fact that the result of the advancement of knowledge could be an unknown pathogen. Salvation for the health of the people is the knowledge and common sense.