The occurrence of complement fixing antibody to the Chlamydia group anti- gen in horses.
D000818:Animals; D000941:Antigens; D002689:Chlamydia / Q000276:immunology*; D003168:Complement Fixation Tests / Q000662:veterinary*; D006734:Horse Diseases / Q000276:immunology*; D006736:Horses; D012141:Respiratory Tract Infections / Q000662:veterinary
D000941:Antigens