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. 2019 Jan 24;9:457. doi: 10.1038/s41598-018-36934-8

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Distribution of farms in the study area. Each black symbol represents a swine farm and each circle represents a neighborhood around a sow farm and redder colors indicate more movements into that neighborhood. The aggregated number of batches between neighborhoods for the first week of 2014 are represented as lines connecting neighborhoods, where color corresponds to the number of batches moved.