title: Revaccination studies in children with graded potency of smallpox vaccines.
mesh_terms: D000293:Adolescent; D000914:Antibodies, Viral / Q000032:analysis; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007117:Immunization, Secondary; D012900:Smallpox Vaccine / Q000008:administration & dosage*; D014611:Vaccination; D012901:Variola virus / Q000276:immunology
chemical_list: D000914:Antibodies, Viral; D012900:Smallpox Vaccine