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. 2022 Jun 22;53:45. doi: 10.1186/s13567-022-01066-5

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Infection risk versus average polarity. A Herds with an average in-strength of less than 4 (n = 8478); B Herds with an average in-strength of 4 or more (n = 4875). Polarity is an indicator of the trading behaviour of a herd, where herds with a polarity between −1 and −0.25 can be considered as predominantly selling herds, between −0.25 and 0.25 as neither predominantly buying or selling herds, and between 0.25 and 1 as predominantly buying herds. Points are coloured according to the probability of a herd being infected. Lines show the density curve. For the definition of infection risk posed see text.