title: Koch's postulates and the etiology of rickettsial diseases.
authors.forename: V A
authors.initials: VA
authors.lastname: Harden
mesh_terms: D000818:Animals; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D012281:Rickettsia / Q000302:isolation & purification; D012282:Rickettsia Infections / Q000209:etiology / Q000266:history*; D014481:United States