Unique characteristics of the National Animal Disease Surveillance system.
D000820:Animal Diseases / Q000191:economics / Q000453:epidemiology*; D000818:Animals; D001771:Blood Banks; D002417:Cattle; D003625:Data Collection; D007886:Legislation, Veterinary; D008462:Meat-Packing Industry / Q000191:economics; D011159:Population Surveillance; D012306:Risk; D014481:United States