[Immunity to poliomyelitis virus in Costa Rica].
D002648:Child; D002675:Child, Preschool; D003364:Costa Rica; D006801:Humans; D007223:Infant; D011051:Poliomyelitis / Q000276:immunology*; D011055:Poliovirus Vaccine, Oral; D014611:Vaccination
D011055:Poliovirus Vaccine, Oral
Inmunidad al virus de la poliomielitis en Costa Rica.