Porcine Epidemic Diarrhea Virus (PEDv) has spread rapidly through the United States swine herd since initial diagnosis in spring 2013. By May 2014, it had been identified in 29 of the contiguous states. Incidence has been greatest in the hog dense states and also Oklahoma and Kansas, as shown in Figure 1. Data are number of positives based on sample genetic tests, taken from National Animal Health Laboratory Network (NAHLN), as reported in www.aasv.org/pedv/PEDv_weekly_report_140326.pdf.
Hennessy, David A.
"Hog Markets and the Porcine Epidemic Diarrhea Virus,"
Agricultural Policy Review: Vol. 2014
, Article 5.
Available at: http://lib.dr.iastate.edu/agpolicyreview/vol2014/iss2/5