A Retrospective Analysis of Postmortem Salmonella Dublin Cases in Dairy Cattle in British Columbia

Figure 3

Distribution of dairy farms in British Columbia that have submitted cattle to the Animal Health Centre, BC Ministry of Agriculture for Postmortem examination between 2007 and 2021. The large circles indicate geographic areas with a greater or lesser number of S. Dublin cases than expected within the indicated time frame. The unit of analysis was farm submission per year. For example, if a farm submitted two positive cases within 1 year, this would be denoted as one case; however, if a farm submitted one positive case every year for 3 years, this would be denoted as three cases. The areas of high and low risk only apply to the labeled timeframe. In the latter example, the cases would only be represented once on the map. Underlay of the map has been removed to preserve producer privacy.