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Clinical significance scores in piglets from vaccinated (Gv) and unvaccinated (Gc) sows during the first 7 dpc. CSS was measured as described in Section 2. Error bars represent standard deviations. P values were calculated by comparing Gv and Gc groups using the Mann-Whitney U test. *, P = 0.001 to 0.05; †, P < 0.001.
