title: Mixed infections.
mesh_terms: D000818:Animals; D002417:Cattle / Q000276:immunology; D003300:Copper / Q000172:deficiency*; D009175:Mycoplasma Infections / Q000276:immunology / Q000662:veterinary*; D012643:Selenium / Q000172:deficiency*; D012756:Sheep / Q000276:immunology
chemical_list: D003300:Copper; D012643:Selenium