The staining useful for antemoem diagnosis of rabies is –
**Core Concept**
Rabies diagnosis involves identifying the presence of the rabies virus or its effects on the nervous system. One of the key methods for ante-mortem diagnosis is through histopathological examination of brain tissue, focusing on the presence of Negri bodies.
**Why the Correct Answer is Right**
The correct answer is **Negri staining**, which is a specific staining technique used to visualize Negri bodies, characteristic inclusions found in the cytoplasm of neurons infected with the rabies virus. Negri bodies are formed due to the aggregation of viral nucleocapsid proteins and are a hallmark of rabies infection. This staining technique is essential for diagnosing rabies in living patients, allowing for prompt initiation of post-exposure prophylaxis.
**Why Each Wrong Option is Incorrect**
* **Option A:** This is incorrect as it does not relate to rabies diagnosis. Other staining techniques may be used for different viral infections or conditions.
* **Option B:** This is incorrect as it is not a specific staining technique for rabies. Other staining techniques may be used for different types of cellular inclusions or infections.
* **Option C:** This is incorrect as it is not a relevant staining technique for rabies diagnosis. Other techniques may be used for diagnosing other viral infections or conditions.
**Clinical Pearl / High-Yield Fact**
It is essential to note that Negri bodies are not always present in the brains of individuals infected with rabies, particularly in the early stages of the disease. Therefore, a combination of clinical findings, laboratory tests, and histopathological examination is often necessary for a definitive diagnosis.
**Correct Answer:** C. Negri staining