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Mean OD value of Stx2e-specific antibodies (±SEM) in serum of piglets at 13 days (first immunization), 26 days (booster immunization), 36 days (10 days after the booster immunization), and 47 days (7 days after challenge) of age. ▵, immunization group (n = 6); ○, control group (n = 3). Piglets were weaned at the age of 30 days.
