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Piglet anti-PCV2 IgG antibody titers. Blood (2 to 5 ml) was collected from offspring of vaccinated (filled black bars) or unvaccinated (filled gray bars) dams at the age of 3, 10, 31, 42, and 63 days postpartum (pp). Anti-PCV2 IgG concentrations were determined by ELISA. At all times, the piglets from vaccinated dams had significantly higher anti-PCV2 antibody titers than piglets from unvaccinated dams (*, P < 0.001).
