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. 2015 Feb 15;11:38. doi: 10.1186/s12917-015-0348-2

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© Bowman et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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A schematic representation of the pork production system with each of the four production flows represented in separate panels. Panels A, B, and C illustrate the three separate multi-site, farrow-to-finish production flows within the pork production system which are referred to as flows A, B, and C respectively. Weaned pigs from flow A are placed into wean-to-finish barns, whereas pigs from flows B and C are weaned into nursery facilities and later moved to finishing barns. Production flow D, as represented in Panel D, is a multiplier herd with a single breed-wean site. Weaned pigs from flow D are raised in gilt developer units or wean-to-finish barns. Production sites where porcine epidemic diarrhea virus (PEDV) was detected during the outbreak are shaded red and the date of PEDV detection is listed.