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. 2020 Jan 7;16:6. doi: 10.1186/s12917-019-2193-1

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© The Author(s). 2020

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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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Fig. 1 — Geographical distribution and PCV2 test results of clinical tissue samples in Henan province from 2015 to 2018. The first number in parentheses represents the total number of samples detected in this area, and the latter number represents the number of PCV2 positive samples detected in this area. The map in this figure is my own