shutterstock_29490655Arizona is the latest state to confirm cases of the deadly Porcine Epidemic Diarrhea virus, a highly contagious pig disease, increasing the tally of U.S. states with confirmed cases to 27, a group of animal health researchers said. Virginia has reported positive samples of the virus in the environment, but not yet in a hog herd, according to data released on Thursday by the U.S. Department of Agriculture’s National Animal Health Laboratory Network. Confirmed cases of PEDv increased by 274 in the week ending March 8, bringing the total number to 4,458 in 27 states. While one case can represent an individual animal or an entire herd at a single site, hog industry analysts estimate PEDv has killed between 4 million and 5 million U.S. hogs since it was discovered in May 2013. MORE