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Mean F4+ E. coli excretion per gram of feces (log10) following intragastric challenge with F4+ E. coli at days 51 and 52 ppi. Pigs were i.d. primed with DNA and orally boosted with F4 fimbriae as shown in Fig. 1. An asterisk indicates significant differences (P < 0.05) in excretion with the control group. Error bars indicate standard errors of the means.
