In early childhood, up to the age of 3, it is in the intestinal tract that the human immune system is formed. It is formed together with the microorganisms that inhabit it. The immune system remembers those microorganisms that live in the body by their genomes (unique individual hereditary constitutions of cells), as if with a special barcode. And then - the end! The training regime is completed, the correct antibodies have been created. From now on, any unknown strain, with an unidentified genome, that enters the body, automatically