Helicobacter pylori is readily demonstrated by a Romanowsky-type stain.

• A. True
• B. False
• C. Only with Gram stain
• D. Not visible with any stain

Answer: (A)

Romanowsky-type stains, such as Giemsa and Wright-Giemsa, are particularly effective for showing Helicobacter pylori in gastric biopsy specimens. These stains color the bacteria a distinct blue-to-purple against the surrounding tissue and mucus, making the curved rods along the surface epithelium easy to spot. The method works well because H. pylori is a Gram-negative organism that colonizes the mucus layer, and the Romanowsky dyes bind to cellular components and nucleic acids to produce clear, contrasting staining of the organisms. Routine Gram staining is less reliable in fixed gastric tissue for routinely visualizing these bacteria, and options claiming it’s only visible with Gram stain or not visible with any stain aren’t accurate.