[FIELD TRIAL OF ORAL POLIO VACCINATION].
D006801:Humans; D011051:Poliomyelitis; D011055:Poliovirus Vaccine, Oral; D013030:Spain; D014611:Vaccination
D011055:Poliovirus Vaccine, Oral
POLIOMYELITIS; POLIOVIRUS VACCINE, ORAL; SPAIN; VACCINATION
CAMPA NA PILOTO DE VACUNACI'ON ANTIPOLIOMIEL'ITICA POR V'IA ORAL.