**Question:** All of the following are features of poliomyelitis except-

A. Ataxia
B. Conjunctival hemorrhages
C. Polydipsia
D. Peripheral neuropathy

**Correct Answer:** .

**Core Concept:** Poliomyelitis is an infectious disease caused by the poliovirus, which primarily affects the central nervous system (CNS). It primarily targets motor neurons, leading to muscle weakness, paralysis, and, in severe cases, respiratory failure.

**Why the Correct Answer is Right:**

A. Ataxia: Poliomyelitis primarily affects motor neurons, leading to muscle weakness and paralysis, not ataxia, which is a neurological sign of impaired coordination and balance due to damage of cerebellar neurons.

B. Conjunctival hemorrhages (petechiae): While poliomyelitis can cause a variety of symptoms, conjunctival hemorrhages are not a typical feature of the disease.

C. Polydipsia (excessive thirst): This is not a specific feature of poliomyelitis, as many other conditions can lead to polydipsia.

D. Peripheral neuropathy: Poliomyelitis primarily affects motor neurons in the CNS, not peripheral nerves, which are primarily affected in peripheral neuropathy.

**Why Each Wrong Option is Incorrect:**

A. Ataxia: As mentioned above, poliomyelitis primarily affects motor neurons in the CNS, not cerebellar neurons in the brainstem, which is responsible for ataxia.

B. Conjunctival hemorrhages: Petechiae are not a typical feature of poliomyelitis and are more commonly seen in conditions such as leukemia or Kawasaki disease.

C. Polydipsia: Although excessive thirst is a common symptom during the early phase of poliomyelitis, it is not specific to the disease. Many other conditions, such as diabetes or dehydration, can also cause polydipsia.

D. Peripheral neuropathy: As mentioned earlier, poliomyelitis primarily affects motor neurons in the CNS, which are responsible for muscle weakness and paralysis. Peripheral neuropathy involves the peripheral nervous system, which is not affected by poliomyelitis.

**Clinical Pearl:** Poliomyelitis, also known as polio, is a viral infection primarily affecting the motor neurons in the CNS, leading to muscle weakness and paralysis. The symptoms listed in options B, C, and D are not specific to poliomyelitis and can be seen in other conditions as well. It is essential to differentiate poliomyelitis from other similar diseases, such as Guillain-Barré syndrome or motor neuron disease, which may present with similar symptoms but have different underlying pathophysiology. A detailed clinical history, neurological examination, and appropriate investigations are necessary for accurate diagnosis.