Genetic engineering and vaccines.
D000941:Antigens / Q000235:genetics; D001424:Bacterial Infections / Q000276:immunology; D005802:Genes, MHC Class II; D005818:Genetic Engineering; D006801:Humans; D010272:Parasitic Diseases / Q000276:immunology; D014612:Vaccines; D014777:Virus Diseases / Q000276:immunology
D000941:Antigens; D014612:Vaccines