Auramine-Rhodamine staining is best observed with which microscopy?

• A. Congo Red stained sections
• B. Auramine-Rhodamine stained sections
• C. Hematoxylin-Eosin stained sections
• D. Gram stained sections

Answer: (B)

Fluorescence microscopy is the method used to view Auramine-Rhodamine staining. This dye is a fluorophore that emits bright yellow-green fluorescence when excited with blue light, making acid-fast bacilli stand out against a dark background. This contrast is why auramine-rhodamine stained sections are observed with fluorescence microscopy, enhancing sensitivity for detecting organisms like Mycobacterium. In contrast, Congo red sections are viewed with polarized light to see amyloid birefringence; Hematoxylin-Eosin and Gram stains are interpreted with standard light microscopy.