Which symptom is NOT associated with poliomyelitis?

Severe headaches and confusion are not characteristic symptoms of poliomyelitis. This viral infection primarily affects the motor neurons of the spinal cord and brainstem, leading to symptoms primarily associated with muscle weakness and paralysis. The hallmark signs include flaccid paralysis, which can occur suddenly after an intense viral replication phase.

Options related to weakness and paralysis, as well as respiratory distress, directly reflect the effects of the virus on the nervous system. In severe cases, the respiratory muscles may become paralyzed, leading to respiratory failure, which highlights the acute nature of the disease. Additionally, the mention of a successful vaccine pertains to the effectiveness of vaccination programs that have dramatically reduced the incidence of polio worldwide, making it rare today, particularly in regions with high vaccination coverage.

While headaches and confusion can be present in many viral infections, they are not specific to poliomyelitis, thus setting them apart from the other symptoms directly linked to the disease's impact on the motor neurons and the effectiveness of vaccination strategies.