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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. 6 — Immunohistochemical detection of PCV2 antigen in conventional pigs. a No detection of PCV2 antigen in lymph nodes of mock pigs. b Very small amounts of PCV2 antigen in lymph nodes of a pig vaccinated with 2×10^4.0 TCID₅₀ dose attenuated PCV1-2b. c Low amounts of PCV2 antigen in nuclei of histiocytes and occasional lymphocytes of a pig vaccinated with inactivated PCV1-2b. d Small amounts of PCV2 antigen in nuclei of histiocytes and occasional lymphocytes of a pig vaccinated with 2×10^3.5 TCID₅₀ dose attenuated PCV1-2b. e Moderate amounts of PCV2 antigen in nuclei of histiocytes and occasional lymphocytes of a pig vaccinated with commercial inactivated PCV2b vaccine X. f High amounts of PCV2 antigen in nuclei of histiocytes and occasional lymphocytes of a nonvaccinated challenged pig. Bar = 20 μm (400×). Hematoxylin-counterstained sections