title: Gross and microscopic skin reactions to killed typhus Rickettsiae in human beings.
mesh_terms: D001428:Bacterial Vaccines; D003168:Complement Fixation Tests; D006801:Humans; D006968:Hypersensitivity, Delayed / Q000276:immunology*; D007110:Immunity, Active; D011511:Proteus / Q000276:immunology; D012281:Rickettsia / Q000276:immunology*; D012283:Rickettsia prowazekii / Q000276:immunology; D012867:Skin / Q000473:pathology; D012882:Skin Tests
chemical_list: D001428:Bacterial Vaccines