[Infantile paralysis; epidemiological characteristics in 1950 and in first semester of 1951].
D001699:Biometry; D006801:Humans; D011051:Poliomyelitis / Q000706:statistics & numerical data*
POLIOMYELITIS/statistics
Paralisis infantil:  caracteristicas epidemiológicas del año 1950 y primer semestre de 1951.