title: [The defense mechanism and its weakening: significance of antigen mutation--antigenic shift and drift of Plasmodium].
mesh_terms: D000953:Antigens, Protozoan / Q000276:immunology*; D006801:Humans; D010961:Plasmodium / Q000235:genetics / Q000276:immunology*; D014612:Vaccines
chemical_list: D000953:Antigens, Protozoan; D014612:Vaccines