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. 2016 Sep 5;12(1):184. doi: 10.1186/s12917-016-0825-2

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© The Author(s). 2016

Open AccessThis 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 — Red deer mean (±SD) seasonal (winter 2012 to winter 2015) skin test response in mm to the intradermal injection of a avian purified protein derivative (aPPD), b bovine PPD (bPPD) and c the mitogen phytohaemagglutinin (PHA). The dashed lines indicate the cut-off value for each PPD