Dieterle Method for Spirochetes and Legionella Organisms reveals spirochetes and bacteria in what color?

• A. Brown to black
• B. Blue
• C. Green
• D. Purple

Answer: (A)

The Dieterle method is a silver-staining technique used to visualize certain delicate organisms, specifically spirochetes and Legionella. In this stain, silver is deposited as metallic silver within the organisms, producing a dark deposit that appears brown to black against a pale background. That’s why spirochetes and Legionella are seen as brown to black structures. The other color options don’t result from this method, since blue, green, or purple are associated with different stains and techniques.