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. 2018 Jul 13;49:60. doi: 10.1186/s13567-018-0557-3

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© The Author(s) 2018

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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Conceptual diagram of the model combining population and infection dynamics. All health states are: susceptible (S), no longer susceptible (R), infected and transiently slightly infectious (I_T), latently infected (I_L), infected and moderately infectious (I_M), and infected and highly infectious (I_H). Solid arrows represent transitions between health states; dashed arrows represent the animals’ contribution to their local environment; w: week; t: week number in the year; a: age in weeks; env: environment.