| COVID-19 | Coronavirus disease of 2019 |
| Ig | Immunoglobulin |
| sIgA | Secretory IgA |
| CpG ODN | CpG oligodeoxynucleotides |
| mLN | Mediastinal lymph node |
| BALF | Bronchoalveolar lavage fluid |
| IN | Intranasal |
| IM | Intramuscular |
| Ad5 | Adenovirus serotype 5-vector |
| Ova | Ovalbumin |
| HRP | Horseradish peroxidase |
| FACS | Fluorescent activated cell sorting |
| MHC | Major histocompatibility complex |
| Tfh | Follicular helper T cell |
| GC | Germinal center |
| TRM | Tissue-resident memory T cell |
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