[Action of Na-RNA on infection in mice infected with Shigella flexneri]

Experiments were conducted on albino mice. Experimentally induced dysentery infection proved to become aggravated under the effect of yeast Na-RNA expressed in the increase of the number of animals which fell ill and perished. This phenomenon proved to be based on the acceleration of reproduction of the causative agent, with a simultaneous selection of its virulent clones seen both in vitro and in vivo.