Good neighbours
Thanks to ability to influence the important processes (maintenance of immunity and a correct metabolism, mastering and synthesis of vitamins) so necessary microflora is numerous in intestines. Together its main representatives — bifido - and a varnish-tobakterii — make about 90 % of all microorganisms living in this body and if them to weigh the figure impresses: to 1,5 kg!
Scientists have more recently become interested, why the immune system suffers such quantity of neighbours? It has appeared, that body fabrics exchange a genetic material and as a result an exchange both those and others become similar against each other with microflora. That is why viruses often attack microflora cages "by mistake", and it turns out, what exactly bacteria take all blow up.