Virus Kills 7,000 Minn. Pigs An illness that only affects pigs is making its way across the Midwest, including here in Minnesota. The Porcine Epidemic Virus (P.E.D.) killed more than 7,000 pigs at a facility near Good Thunder last December. Pork producers say newborn piglets are most susceptible, and it's always fatal. The virus’ devastation cost the facility about $500,000.