title: Studies on natural cases of maedi in search for diagnostic laboratory methods.
mesh_terms: D000818:Animals; D003168:Complement Fixation Tests; D009500:Neutralization Tests; D012756:Sheep; D012757:Sheep Diseases / Q000175:diagnosis*; D014777:Virus Diseases / Q000175:diagnosis / Q000662:veterinary*; D014713:Viruses, Unclassified / Q000302:isolation & purification