In direct microscopic examination, spore and hyphae stain how on Gram stain?

In direct microscopic examination, spore and hyphae stain how on Gram stain?

• A. Spore and hyphae stain Gram positive
• B. They stain Gram negative
• C. They do not stain
• D. They appear clear

Answer: (A)

In direct microscopic examination of fungi, spore and hyphae typically stain Gram positive. This happens because fungal cell walls contain thick layers of polysaccharides and chitin that trap the crystal violet–iodine complex and resist decolorization during the Gram procedure, so the structures appear purple under the microscope. While Gram staining isn’t perfectly reliable for fungi and results can vary with age or technique, the common observation is a Gram-positive appearance. They aren’t normally clear, and they aren’t typically Gram negative; if staining is poor or old, results can be variable, which is why other fungal-specific stains are often used for confirmation.

In direct microscopic examination of fungi, spore and hyphae typically stain Gram positive. This happens because fungal cell walls contain thick layers of polysaccharides and chitin that trap the crystal violet–iodine complex and resist decolorization during the Gram procedure, so the structures appear purple under the microscope. While Gram staining isn’t perfectly reliable for fungi and results can vary with age or technique, the common observation is a Gram-positive appearance. They aren’t normally clear, and they aren’t typically Gram negative; if staining is poor or old, results can be variable, which is why other fungal-specific stains are often used for confirmation.