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. 2014 Jul 9;56(1):39. doi: 10.1186/1751-0147-56-39

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Copyright © 2014 Ohlson et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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High and low risk clusters. Clusters with more (red lines) or less (blue lines) test positive herds than expected based on analysis of results from a bulk milk survey used to investigate the prevalence of antibodies against Coxiella burnetii in Swedish dairy cattle (2008/2009). Cluster analysis was based on exact coordinates and performed using the spatial scan statistic. The numbers within clusters are the calculated relative risk of each cluster compared to areas outside the cluster. ©Lantmäteriet 2013.