| SIgA | Secretory immunoglobulin A |
| PM-sEVs | Porcine milk small extracellular vesicles |
| PIgR | Polymeric immunoglobulin receptor |
| IEC | Intestinal epithelial cell |
| SC | Secretory component |
| PCR | Polymerase Chain Reaction |
| ELISA | Enzyme-linked immunosorbent assay |
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