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. 2016 Jul 4;12:138. doi: 10.1186/s12917-016-0753-1

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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. 2 — Distribution of morbidity of CPV infection in relation to dog age. The incidence of morbidity at different ages was 83/836, 319/3154, 291/2584, 145/1765, 116/1516, 75/1224, 68/1916, 41/1610, 24/2210 and 7/3092, respectively. The morbidity was relatively high in the first 4 months with the highest recorded in month 3 (◆). After month 3, morbidity gradually decreased. However, as a whole, P-value was <0.05 for morbidity in relation to dog age. Statistical analysis was performed using the χ² test