On the 77th day, there was an obvious trend of PG1-S1+ PG1-N > PG2-S1 + PG2-N > PG1-S1 > PG2-S1 in the titers of IgA in the intestinal mucus (Fig. 4f ).
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High-level mucosal and systemic immune responses induced by oral administration with Lactobacillus-expressed porcine epidemic diarrhea virus (PEDV) S1 region combined with Lactobacillus-expressed N protein.
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