title: Preparation of complement-fixing antigens from tissue of dogs infected with Neorickettsia helminthoeca.
mesh_terms: D000645:Ammonium Sulfate; D000818:Animals; D000942:Antigens, Bacterial / Q000302:isolation & purification*; D003168:Complement Fixation Tests; D004285:Dogs; D004912:Erythrocytes / Q000276:immunology; D005019:Ethyl Ethers; D005612:Freeze Drying; D006863:Hydrogen-Ion Concentration; D008198:Lymph Nodes / Q000032:analysis / Q000276:immunology; D008722:Methods; D012287:Rickettsiaceae / Q000276:immunology; D012288:Rickettsiaceae Infections / Q000276:immunology* / Q000662:veterinary*; D013154:Spleen / Q000032:analysis / Q000276:immunology; D013950:Thymus Gland / Q000032:analysis / Q000276:immunology; D014238:Trichloroacetic Acid
chemical_list: D000942:Antigens, Bacterial; D005019:Ethyl Ethers; D014238:Trichloroacetic Acid; D000645:Ammonium Sulfate