Immunity of school children two years after oral poliomyelitis vaccination.
D000293:Adolescent; D000906:Antibodies / Q000097:blood; D002648:Child; D006801:Humans; D007109:Immunity; D009820:Ohio; D011055:Poliovirus Vaccine, Oral
D000906:Antibodies; D011055:Poliovirus Vaccine, Oral