Most common type of pathological changes seen in Rabies are
**Core Concept**
Rabies is a viral disease caused by a lyssavirus that affects the central nervous system (CNS) of mammals, including humans. The disease is characterized by inflammation of the brain and spinal cord, leading to severe neurological symptoms.
**Why the Correct Answer is Right**
The most common pathological changes seen in rabies are neuronal degeneration and necrosis, particularly in the hippocampus, amygdala, and cerebral cortex. This is due to the direct cytopathic effect of the rabies virus on neurons, leading to apoptosis and inflammation. The virus also causes vasculitis and perivascular cuffing, which further exacerbates the damage to the CNS.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the most common pathological changes seen in rabies. While there may be some degree of inflammation and edema, these are not the primary features of the disease.
**Option B:** This option is incorrect because it is too nonspecific and does not accurately reflect the characteristic pathological changes seen in rabies. While some degree of neuronal degeneration and necrosis may occur in various neurological disorders, the pattern and distribution of these changes in rabies are distinctive.
**Option C:** This option is incorrect because it is not supported by the pathophysiology of rabies. The disease does not primarily involve the peripheral nervous system, and the characteristic pathological changes are confined to the CNS.
**Option D:** This option is incorrect because it is too vague and does not accurately describe the most common pathological changes seen in rabies. While some degree of inflammation and edema may occur in various neurological disorders, the specific pattern and distribution of these changes in rabies are characteristic of the disease.
**Clinical Pearl / High-Yield Fact**
One key point to remember is that the presence of Negri bodies, which are characteristic intracytoplasmic inclusions found in infected neurons, is a classic pathological feature of rabies. These inclusions are formed by the aggregation of viral nucleocapsids and are a key diagnostic feature of the disease.
**Correct Answer:** C. Neuronal degeneration and necrosis.