[Massive vaccination against poliomyelitis].
D002675:Child, Preschool; D006801:Humans; D008800:Mexico; D011051:Poliomyelitis / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral; D014611:Vaccination
D011055:Poliovirus Vaccine, Oral
Vacunación masiva contra la poliomielitis.