Incidence of listeriosis in Pennsylvania livestock.
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology*; D006041:Goats; D008088:Listeriosis / Q000453:epidemiology / Q000662:veterinary*; D010414:Pennsylvania; D011817:Rabbits; D012756:Sheep; D012757:Sheep Diseases / Q000453:epidemiology; D013552:Swine; D013553:Swine Diseases / Q000453:epidemiology