[Epidemiology of infantile paralysis in Americans; first part].
D001699:Biometry; D005006:Ethnicity; D006801:Humans; D011051:Poliomyelitis / Q000453:epidemiology* / Q000706:statistics & numerical data*; D014481:United States
POLIOMYELITIS/epidemiology and statistics
Epidemiologia de la parálisis infantil en las Américas; primera parte.