title: Complement-fixing antibodies in sera of sheep affected with visna and maedi.
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D000906:Antibodies; D003165:Complement System Proteins; D012756:Sheep; D014777:Virus Diseases / Q000276:immunology*; D014713:Viruses, Unclassified / Q000276:immunology*
chemical_list: D000906:Antibodies; D003165:Complement System Proteins