BISMARCK, N.D. (AP) — State veterinarians in the Dakotas are stressing the need for people in the hog industry to take measures to guard against the spread of deadly pig viruses, after two new cases were confirmed in South Dakota.

South Dakota veterinary officials this week said two more farms have confirmed cases of Swine Enteric Coronavirus Diseases, bringing the state total to 38 farms. Most of the cases are the Porcine Epidemic Diarrhea virus, which has killed millions of pigs in the U.S. in the past year and has been blamed for sharp increases in the price of pork products such as bacon.