Of immunizers, immunity, and immunization.
D000486:Allergy and Immunology / Q000266:history*; D001402:B-Lymphocytes / Q000276:immunology; D003140:Communicable Disease Control; D003165:Complement System Proteins / Q000502:physiology; D005060:Europe; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D007109:Immunity; D007114:Immunization; D007125:Immunogenetics; D008264:Macrophages / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology
D003165:Complement System Proteins