Nebraska has reported its first case of Porcine Epidemic Diarrhea Virus (PEDV), making it the 20th U.S. state where the virus has spread. The first Nebraska PEDV case was confirmed by the American Association of Swine Veterinarians (AASV) during the week of December 1.

According AASV, the 140 PEDV cases reported in the U.S. during the week of Dec. 1 is the highest weekly number since the virus was first discovered in the U.S. during the spring of 2013. Iowa, which borders Nebraska, had the most new cases reported for the week with 67.

The virus causes diarrhea, vomiting and severe dehydration in pigs, and can have up to a 100 percent mortality rate with piglets.