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. 2019 Jul 30;50:58. doi: 10.1186/s13567-019-0677-4

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© The Author(s) 2019

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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Salmonella prevalence. The overall proportion of samples positive for Salmonella (A). Dust, nest box and egg belts swabs exhibited the highest mean proportion of positive samples, but no significant difference was observed between sample types (P > 0.05). Average total Salmonella load (B) was highest for swabs collected from nest boxes, followed by dust and floor swabs. No statistically significant differences were detected between bacterial loads (P > 0.05).