Diseases occur, as sometimes it may seem, out of nowhere, then you have to bother with them. However, each disease has a cause and a result either of the outside world or from ourselves. It is worth to know the distribution of pathogens, since it is essential to prevent potential threats in the future, and realize what is wrong in our work. Basic pathogens are four and each has a different origin. The first is a biological agent, which can influence (in risk reduction. There are all kinds of nest parasites in the body, flatworms, arthropods, and what you can annoy the most - viruses. The other factors are the origin, characteristics, or everything that may do us harm, \"outside\" - radiation, soil, any contamination, and even the weather. Penultimate group are the social factors that are developing and becoming more damaging and technological progress. We are dealing with stress, pressure, and inadequate living conditions . Last, and very often unpreventable group, are genetic factors, for example, which inherit from their parents. The genes we have no control, and rather hard to prevent the development of the disease, unless they perceive the seeds of its relatively early.

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