Scoring system according to Danielsson et al61
| Grade 1 | Normal mucosa |
| Grade 2 | Slight inflammation: isolated inflammatory cells or cell aggregates of either lymphoplasmocytic cells or eosinophils |
| Grade 3 | Intermediate inflammation: marked increase of inflammatory cells with some changes in secretory cells; mild atrophy |
| Grade 4 | Severe inflammation: crypt abscesses; lymphoid follicles in deeper cell layers; massive increase in inflammatory cells and pus; marked atrophy |
| Grade 5 | Fulminant inflammation: ulcerations with pus; crypt abscesses; atrophy; deep follicles |