Modern transportation as an instrument in the spread of livestock diseases.
D000820:Animal Diseases / Q000453:epidemiology*; D000818:Animals; D002353:Carrier State / Q000662:veterinary; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology; D002645:Chickens; D003132:Commerce; D003141:Communicable Diseases / Q000662:veterinary*; D005544:Forecasting; D011201:Poultry Diseases / Q000453:epidemiology; D013552:Swine; D013553:Swine Diseases / Q000453:epidemiology; D013997:Time Factors; D014481:United States