The virus or viruses are part of the communication mechanisms between cells, they contain genetic material in a protein capsule and they have receptors on top that bind to the following cells. Cells produce it, especially dying cells, to alarm other cells that there is high toxicity in the environment and so that they all enter a state of conservation of life.
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Therefore a person in that state will enter that mode and that removes all the energy from the body creating discomfort. So a cell that receives a toxic signal for whatever reason triggers the alarm by excreting what human science calls “virus.” To alert others. If the toxicity is greater than a certain range, then many cells will secrete what they call virus, which is also a cellular mechanism for excreting or getting rid of internal toxicity.