title: Some unanswered questions about vaccination.
authors: USDA, Plum Island Animal Disease Center, Greenport, NY 11944-0848.
authors: F
authors: F
authors: Brown
mesh_terms: D000940:Antigenic Variation; D000956:Antigens, Viral / Q000235:genetics; D006801:Humans; D014611:Vaccination / Q000009:adverse effects; D014612:Vaccines / Q000276:immunology; D014765:Viral Vaccines / Q000009:adverse effects / Q000276:immunology
chemical_list: D000956:Antigens, Viral; D014612:Vaccines; D014765:Viral Vaccines