title: Isolation from Bordetella pertussis of protective antigen free from toxic activity and histamine sensitizing factor.
mesh_terms: D000818:Animals; D000937:Antigen-Antibody Reactions; D001835:Body Weight; D001886:Bordetella pertussis; D006632:Histamine / Q000378:metabolism*; D006969:Hypersensitivity, Immediate; D051379:Mice; D010567:Pertussis Vaccine / Q000633:toxicity*; D014461:Ultracentrifugation
chemical_list: D010567:Pertussis Vaccine; D006632:Histamine