title: Possible reasons for the inefficiency of Gram-negative bacterial vaccines.
mesh_terms: D000917:Antibody Formation; D000942:Antigens, Bacterial; D001419:Bacteria / Q000276:immunology*; D001428:Bacterial Vaccines; D005075:Biological Evolution; D001886:Bordetella pertussis / Q000276:immunology; D002003:Brucella abortus / Q000276:immunology; D002462:Cell Membrane / Q000276:immunology; D007111:Immunity, Cellular; D007114:Immunization; D008070:Lipopolysaccharides; D009344:Neisseria gonorrhoeae / Q000276:immunology; D011135:Polysaccharides, Bacterial; D012485:Salmonella typhi / Q000276:immunology; D012760:Shigella / Q000276:immunology; D014121:Toxoids; D014210:Treponema pallidum / Q000276:immunology; D014734:Vibrio cholerae / Q000276:immunology
chemical_list: D000942:Antigens, Bacterial; D001428:Bacterial Vaccines; D008070:Lipopolysaccharides; D011135:Polysaccharides, Bacterial; D014121:Toxoids