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. 2015 Jul 30;12:113. doi: 10.1186/s12985-015-0338-9

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© Li et al. 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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Fig. 3 — Comparison of the PCV2 DNA loads in sera of the differently treated pigs challenged with PCV2. The PCV2 genomic copy load was presented as a log₁₀ value of PCV2 genomic copy load per 1 ml of sera. Different letters (A, B) indicate significant differences among different groups at 7, 14, or 21 DPC (P < 0.05)