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.

Virological study 6 fatal cases of poliomyelitis was made, having poliovirus isolated from different organ samples taken during the autopsy. Poliovirus Type I. mesenteric ganglion marrow, large intestine, liver, spleen was isolated. Poliovirus type II, bone, intestine, rectal scraping. Poliovirus Type III marrow, mesenteric ganglion, large intestine, small intestine, liver, spleen and kidney.