title: The challenges of challenge experiments.
authors.affiliation: From the Department of Medical History and Bioethics, University of Wisconsin, Madison.
authors.forename: Susan E
authors.initials: SE
authors.lastname: Lederer
mesh_terms: D032984:Ethics, Research / Q000266:history; D005260:Female; D064368:Healthy Volunteers / Q000266:history*; D049671:History, 18th Century; D049673:History, 20th Century; D049674:History, 21st Century; D006805:Human Experimentation / Q000941:ethics / Q000266:history*; D006801:Humans; D008297:Male; D012899:Smallpox / Q000266:history / Q000517:prevention & control; D012900:Smallpox Vaccine / Q000266:history*
chemical_list: D012900:Smallpox Vaccine