Rocky Mountain Spotted Fever

adult agent animals antibodies antigen appeared areas associated become Bitter Root Valley blood Board body cause cells cent changes CHAPTER Chicago clinical contained continued cultures death decreased demonstrated Dermacentor died disease doses early edema effect eggs experimental experiments fatal feed female findings guinea pigs Howard human Idaho immune increase Indians infected inoculated laboratory later lesions material method Montana months Mountain spotted fever normal observed obtained occurred organism PABA parasite Parker patients period plasma prepared present produced protective protein Proteus Public Health rabbits rash reaction reported Ricketts rickettsiae River Rocky Mountain spotted season seen serum Service severe showed skin specific spring strains studies suggested summer symptoms temperature therapy tick tion tissue transmission transmitted treated treatment typhus fever University usually vaccine virulent virus volume week Weil-Felix