Researchers at the University of Minnesota have found a new strain – the third variety – of porcine epidemic diarrhea virus, a disease that has killed at least eight million baby pigs, says Reuters. The new strain was identified in a Minnesota hog herd and may be a mutation of the original virus, which appeared in the United States in mid 2013. The original strain may have evolved as hog herds developed immunity to other strains, said the article. PEDv reduced the number of U.S. piglets by 10 percent last year and contributed to record prices for pork.