All of the following are features of poliomyelitis except –
**Core Concept**
Poliomyelitis is a highly infectious disease caused by the poliovirus, leading to inflammation of the spinal cord (myelitis) and potentially resulting in muscle weakness, paralysis, or even death. The poliovirus primarily affects the motor neurons in the spinal cord, disrupting the normal functioning of the nervous system.
**Why the Correct Answer is Right**
The correct answer features of poliomyelitis include fever, headache, sore throat, and vomiting, which are the common prodromal symptoms of the disease. The poliovirus enters the body through the gastrointestinal tract and initially causes a mild illness, but in some cases, it can lead to the more serious and debilitating symptoms of poliomyelitis, such as muscle weakness and paralysis. The virus targets the motor neurons in the spinal cord, leading to the characteristic symptoms of the disease.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Guillain-Barré Syndrome is an autoimmune disorder that occurs when the immune system mistakenly attacks the peripheral nerves, leading to muscle weakness and paralysis. While both poliomyelitis and Guillain-Barré Syndrome can cause muscle weakness, they have distinct underlying mechanisms and are not directly related.
**Option B:** This option is incorrect because meningitis is an inflammatory condition that affects the protective membranes (meninges) surrounding the brain and spinal cord. While poliomyelitis can cause inflammation of the spinal cord (myelitis), meningitis is a separate condition that can be caused by various factors, including bacterial and viral infections.
**Option C:** This option is incorrect because rabies is a viral infection that primarily affects the nervous system, but it is caused by a different virus (lyssavirus) and has distinct clinical features, such as hydrophobia and aggression. While both poliomyelitis and rabies can cause neurological symptoms, they have different underlying mechanisms and are not related.
**Clinical Pearl / High-Yield Fact**
A key feature of poliomyelitis is the asymmetric distribution of muscle weakness, with some muscles being affected more than others. This is due to the random nature of the poliovirus infection, which can target specific motor neurons in the spinal cord, leading to the characteristic asymmetric weakness.
**Correct Answer:** A.