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agent andersoni animals antibiotics antibodies antigen areas blood Brill's disease burnetii C.F. tests cent centrifugation cepa clinical cobayos commensal commensal rats complement fixation complement-fixing conside nized cotton rats counties dairy dental dentists dilution dose ectoparasites eggs endemic endemic typhus epidemic typhus experiencia febrile fever rickettsiae fluke guinea pigs Health Rep herds hosts huevo human Idaho immune infected inoculated isolated known Conc lesions Luoto mice milk mite Mountain spotted fever murine typhus National Institute negative Norway rats º º occurred organisms pase patient percent period pooled population positive premises Q fever rash rat fleas reactions reported Rickettsia rickettsii rickettsial disease rickettsialpox RMSF Rocky Mountain Laboratory Rocky Mountain spotted rodents roof rats sera serologic serum species specimens spleen spotted fever group strains suspensions Table tick typhus tion tissues titers toxin Twin Falls county typhus antibodies typhus fever vaccine vector virulent virus yolk sac