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Table 1 Modified scoring system for H. pylori density.

From: Mast cell density in gastric biopsies of pediatric age group and its relation to inflammation and presence of Helicobacter pylori

Density of H. pylori Histological features
0 No Bacteria
1 Few bacteria (5 to 10) observed only under ×40 magnification
2 Patchy distribution (<50 of total surface crypts) with lower density (NCB<10)
3 Patchy distribution (<50 of total surface crypts) with higher-density (NCB>10)
Or diffuse distribution (>50 of total surface crypts) with mixture of low-density (NCB<10)
4 Diffuse distribution (>20 of total surface crypts) with mixture of high (NCB>10) and low-density (NCB<10)
5 Diffuse distribution (>50 of total surface crypts) all with high density (NCB>10)
  1. NCB = Number of H. pylori in each crypts