title: Immunity and epidemiology of helminthiasis in grazing animals.
authors: J D
authors: JD
authors: Kelly
mesh_terms: D000822:Animal Husbandry; D000818:Animals; D002417:Cattle; D006374:Helminthiasis, Animal / Q000453:epidemiology* / Q000276:immunology* / Q000517:prevention & control; D007411:Intestinal Diseases, Parasitic / Q000453:epidemiology / Q000276:immunology / Q000662:veterinary; D009520:New Zealand / Q000453:epidemiology; D012756:Sheep