Which of the following stains is used to study fungal morphology in tissue sections –
**Core Concept**
Fungal morphology in tissue sections is crucial for diagnosing various fungal infections, such as aspergillosis and mucormycosis. The choice of stain can significantly impact the accuracy of fungal identification.
**Why the Correct Answer is Right**
Periodic Acid-Schiff (PAS) stain is widely used to study fungal morphology in tissue sections. This stain works by breaking down the polysaccharides present in fungal cell walls, which then react with the Schiff reagent, producing a magenta-colored product. PAS stain is particularly useful for identifying fungi that have a high content of glycogen, such as Aspergillus species. The PAS stain also helps in highlighting the fungal hyphae, which can be a key diagnostic feature in tissue sections.
**Why Each Wrong Option is Incorrect**
**Option A:** H&E stain is a general-purpose stain that is widely used for histopathological examination but is not specific for fungal morphology.
**Option B:** Gomori Methenamine Silver (GMS) stain is used for detecting fungi in tissue sections, but it is more specific for detecting certain types of fungi, such as Aspergillus and Mucor species, rather than being a general-purpose stain for fungal morphology.
**Option C:** Alcian blue stain is used for detecting mucin and other glycosaminoglycans in tissue sections, but it is not specific for fungal morphology.
**Clinical Pearl / High-Yield Fact**
PAS stain is a versatile stain that can also be used to identify other cellular elements, such as glycogen in cells and basement membrane material, making it a valuable tool in histopathological examination.
**Correct Answer: C. Gomori Methenamine Silver (GMS) stain is used for detecting fungi in tissue sections, but it is more specific for detecting certain types of fungi, such as Aspergillus and Mucor species, rather than being a general-purpose stain for fungal morphology.