title: Microbial challenge studies--a challenge worth accepting.
authors.affiliation: Cochrane Vaccines Field, 00061 Anguillara Sabazia, Rome, Italy. Toj1@aol.com
authors.forename: Tom
authors.initials: T
authors.lastname: Jefferson
mesh_terms: D003139:Common Cold / Q000188:drug therapy / Q000209:etiology* / Q000517:prevention & control*; D032984:Ethics, Research; D005260:Female; D006805:Human Experimentation / Q000592:standards*; D006801:Humans; D007239:Infections / Q000628:therapy; D008297:Male; D035842:Research Subjects