FIELD : medicine. SUBSTANCE : group of inventions relates to medicine and can be used to modulate the immune system. To this end, the method comprises administering an immunogenic composition containing Koch tuberculin, purified protein derivative (PPD) of the Koch bacillus, inactivated staphylococcal lysate, inactivated streptococcal lysate, streptokinase and dornase from beta-hemolytic streptococcus, inactivated Candida lysate, inactivated dermatophyte lysate, inactivated enteropathogenic Escherichia coli lysate, inactivated salmonella lysate. Also provided are the use of an immunogenic composition, a method of preventing or treating diseases, a method of inducing the regeneration of organ systems, and a method for restoring an immune response. EFFECT : group of inventions provides for the prevention and treatment of diseases by modulating the human immune system. 31 cl, 2 tbl, 7 dwg, 8 ex