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Anti-PCV2 IgG response. Pigs were vaccinated against PCV2 at 3 weeks of age (dpv 0 or dpc −28) and challenged with PCV2d at 7 weeks of age (dpv 28 or dpc 0). Data presented as mean group log10 ELISA titer ± SEM. Group means include positive and negative pigs. Significantly different values for a dpc are indicated by different superscripts. The significance level was set to P > 0.05.
