Wisconsin's state veterinarian has been asked to help in the fight against a virus that has killed millions of pigs in the past year. Porcine Epidemic Diarrhea causes severe diarrhea in newborn piglets, who die of dehydration. The virus is believed to have come from China and showed up in the U.S. last May. The U.S. Department of Agriculture is requiring farms to report outbreaks of PED and participate in a program to help control the disease. Wisconsin state veterinarian, Dr. Paul McGraw, has been asked to help develop that program. Wisconsin agriculture Secretary Ben Brancel said Tuesday in a statement that McGraw was asked to help in part because he has raised pigs himself. Brancel also says McGraw has been proactive in increasing biosecurity in Wisconsin.