Obligatory poliovaccination in Belgium: ten years after.
D001530:Belgium; D006801:Humans; D007223:Infant; D007883:Legislation, Medical; D011051:Poliomyelitis / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral; D012189:Retrospective Studies; D014611:Vaccination
D011055:Poliovirus Vaccine, Oral