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. 2015 Mar 21;46(1):37. doi: 10.1186/s13567-015-0166-3

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© Frydas 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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Virus titers in nasal secretions of pigs inoculated with PRRSV 13V091, 13V117 and 07V063. Lines represent the mean value in each group. Whiskers denote the standard deviation (SD). The dotted line gives the detection limit for virus titration. Letters denote significant statistical differences (P < 0.05) between viral strains (a: 13V091 and 13V117, b: 13V091 and 07V063, c: 13V117 and 07V063).