Solk's vaccine prepared from poliomyelitis viruses helps an organism to develop own protective properties preventing a paralytic stage of a disease.
But for this purpose some weeks are necessary.
The vaccine will not help if the child already was in contact with the patient.
Partial protection is provided by gamma globulin.
But he acts only within several weeks because the organism of the child does not create it gamma globulin receive from blood of the adults possessing somewhat protective properties against this disease.