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Rapid dissemination of porcine epidemic diarrhoea virus (PEDV) throughout the United States in the first 8 weeks after introduction. States shown in black represent new positives during each week; states shown in grey represent those identified as positive during previous weeks. Adapted from data compiled by the Iowa State University Veterinary Diagnostic Laboratory. https://www.aasv.org/aasv%20website/Resources/Diseases/PED/LABSUMTOT_WK_STATE.pdf
