| EF | Extracellular factor protein |
| ELISA | Enzyme-linked immunosorbent assay |
| epf | Extracellular factor protein coding gene |
| MHC | Major histocompatibility complex |
| rEF | Recombinant extracellular factor protein |
| Rg | Radius of gyration |
| RMSD | Root mean square deviation |
| RMSF | Root mean square fluctuation |
| SASA | Solvent accessible surface area |
| SLY | Suilysin or thiol activated cytolysin |
| sly | Suilysin coding gene |
| sTLR2 | Swine toll-like receptor 2 |