title: Immunologic preparative effect in guinea pigs of small doses of Rickettsia prowazeki, strain E.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D003168:Complement Fixation Tests; D006168:Guinea Pigs; D007115:Immunization Schedule; D051379:Mice; D009500:Neutralization Tests; D012283:Rickettsia prowazekii; D014438:Typhus, Epidemic Louse-Borne / Q000517:prevention & control*; D014612:Vaccines / Q000008:administration & dosage* / Q000009:adverse effects / Q000592:standards
chemical_list: D014612:Vaccines