(a)

(b)

(c)

Figure 3: H. pylori aggregation on the surface of gastric mucosa. H. pylori was detected as (a) light blue staining using toluidine blue, (b) brownish-black staining using Warthin-Starry silver, and (c) light purple using H&E. Arrows indicate H. pylori bacilli. Magnification, 400x.