Porcine epidemic diarrhea virus has been confirmed in U.S. swine for the first time. Infected animals were found on farms in Iowa, Indiana and Colorado, but experts fear the virus may be more widespread. Although PEDV is not a zoonotic pathogen, it is potentially fatal, especially in young swine. Strict biosecurity measures exist to prevent this kind of problem. "To be in different states, and to have crossed between different swine operations and between different owners, all of which are painstakingly kept separate to prevent the spread of disease -- that's unusual," said Colorado state veterinarian Keith Roehr.