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. 2015 Dec 21;11:303. doi: 10.1186/s12917-015-0617-0

Fig. 3.

Fig. 3

Monthly PRRSV seroprevalence in Danish pig herds. The figure illustrated the monthly PRRSV type 1 (a) and type 2 (b) seroprevalence in production and breeding herds from January 2007 to December 2010