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. 2020 Oct 26;10(1):1794668. doi: 10.1080/20008686.2020.1794668

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© 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

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 cited.

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Figure 4. — Relationship between age (X axis), odds for seropositivity (Y axis) and south-north geographic location (Facets). Facets show Y coordinates (‘y.cord’) stratified by 50 Km intervals. The higher the Y coordinate the norther the location. There is a positive increase in the odds for seropositivity with age (the older the animal the higher the odds for serpositivity) in the southern part (y coordinates ≤ 360 Km) of The Netherlands. This relationship changes in the northern regions (Y coordinates >360) with the odds for seropositivity decreasing with age (odds for seropositive higher in younger animals than older animals)