[Study on acute poliomyelitis in Puerto Rico during the first 6 months of 1956].
D006801:Humans; D011051:Poliomyelitis / Q000453:epidemiology*; D011647:Puerto Rico
POLIOMYELITIS; POLIOMYELITIS/epidemiology
Estudio sobre la poliomielitis aguda en Puerto Rico durante el primer semestre del 1956.