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. 2018 May 24;221:13–18. doi: 10.1016/j.vetmic.2018.05.014

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Fig. 1 — Map of the 12 provinces of the Netherlands. A) Pig herd density in 2014. B) Herd sampled to determine the seroprevalence for infection with PEDV from May till December 2014. C) Areas with PCR positive PEDV herds registered by GD Animal Health from November 2014 till January 2016. The darker the color, the more farms were positive. UBN: Unique Herd Number.