title: [Symposium on problems involved in vaccination].
mesh_terms: D000367:Age Factors; D000917:Antibody Formation; D006801:Humans; D007223:Infant; D012900:Smallpox Vaccine / Q000009:adverse effects; D014611:Vaccination; D012901:Variola virus / Q000472:pathogenicity
chemical_list: D012900:Smallpox Vaccine