Michael Yezzi raises 1,000 pigs a year in Shushan, N.Y. He's worried about how to keep his farm safe from a disease that has no proven cure. Abbie Fentress Swanson for NPR hide caption

itoggle caption Abbie Fentress Swanson for NPR

France has banned imports of live pigs and other products from the U.S. to keep out a virus that has killed more than 4 million pigs in the U.S. Here, young pigs look out of a pen at a North Dakota hog farm in a 2005 file photo. Will Kincaid/AP hide caption

itoggle caption Will Kincaid/AP

A screen grab from an undercover video released by the Humane Society of the U.S. shows a pig in a gestation crate at Iron Maiden Farms in Owensboro, Ky. Courtesy of The Humane Society of The United States hide caption

itoggle caption Courtesy of The Humane Society of The United States

Pitmaster Rodney Scott seasons a roasting hog behind a barbecue restaurant in Birmingham, Ala. Scott has been touring the South with a makeshift barbecue pit to raise money to rebuild his family's cookhouse after it burned down in November. Debbie Elliott/NPR hide caption

itoggle caption Debbie Elliott/NPR

Piglets at Hilldale Farm in State Center, Iowa in March 2013, just before porcine epidemic diarrhea began spreading through hog farms in the U.S. Amy Mayer/Harvest Public Media hide caption

itoggle caption Amy Mayer/Harvest Public Media

A traditional Danish pork roast, common for Christmas dinner in Denmark. Pork finds its way into most Danish meals. SNSK2010/via flickr hide caption

itoggle caption SNSK2010/via flickr

Berkshire pigs on Happy Hula Farm, a member of the Eden Farms collective. Amy Mayer/Iowa Public Radio hide caption

itoggle caption Amy Mayer/Iowa Public Radio