| ELISA | Enzyme-linked immunosorbent assay |
| H. pylori | Helicobacter pylori |
| kELISA | ELISA commercial kit |
| OD | Optical density |
| wELISA | In-house ELISA based on H. pylori surface whole cell antigen |
| sELISA | In-house ELISA based on H. pylori sonicate whole cell antigen |
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