6 samples of cerebrospinal fluid was subjected to virological study post-mortem, from 6 cases of Paralytic Poliomiellitis occurred in the Children's Hospital (Lima), having obtained the following results: In case 1, poliovirus type II was isolated; in case 3, poliovirus type III asisló; in case 4, Poliovirus Type I, and the cases 2, 5 and 6 were negative was isolated.

107 stool samples from normal children in tube cultures of the strain was inoculated Hela established; obtained 30 strains which corresponded, 8 type I poliovirus strains, four strains of poliovirus Type II, two type III poliovirus strains and 16 strains were not identified.