What symptom often accompanies the acute phase of poliomyelitis?

The acute phase of poliomyelitis is characterized by the onset of symptoms that can lead to significant neurological impacts, with paralysis being a hallmark symptom. Poliomyelitis primarily affects the nervous system, and as the virus attacks motor neurons in the spinal cord and brainstem, it can lead to muscle weakness and, in some cases, paralysis. This paralysis can manifest suddenly and can severely impact various muscle groups, which is a critical aspect of the disease.

While high fever, severe joint pain, and nasal congestion may be associated with other illnesses or even some viral infections, they do not specifically define the acute phase of poliomyelitis. The emphasis on paralysis as a key symptom reflects the disease's serious nature and the significant risks it poses to motor function and mobility, making it the most relevant choice in understanding the acute manifestations of poliomyelitis.