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The pathogen is prion, special protein, and also any microorganism (a bacterium, a virus, mushrooms and so forth) which is capable to lead to an illness (morbid condition) of other organism. In a general sense under pathogenic mean any external factor which can lead to development of any pathologies or diseases, disturbance of activity of any system of an organism.
Pathogenic microorganisms are the parasitizing microorganisms that is using the owner.
Priona are specific infectious agents who lead to a serious illness of TsNS of the person. Will catch priona it is possible from food, they are not dissolved by digestive enzymes and freely get through an intestines wall into the central nervous system, finally. Besides, transfer of prion and is possible an airborne way.
The negative impact on an organism of pathogens is provided at the expense of various mechanisms which can give intoxications, to disturbance of regulatory and other and other mechanisms in an organism, to destruction of fabrics and bodies. Negative impact of infectious pathogens is connected, as a rule, with impact of products of their life activity on the person, and also their reproduction. Such pathogenic microorganisms can move between owners in various ways of transfer: contact, airborne, haemo contact and others. As a result the infectious disease at several owners develops.
In the majority a case each specific pathogen can lead to exclusively one disease, that is the pathogenic microorganism is the specific activator. Existence of a specific pathogen in a human body means also existence specific a disease, in case of lack of such microorganism the disease cannot arise.
Thus, the concept of a pathogen is equated to concept of the activator – the term for designation of the infectious agent.