Final answer:
The weakness in limbs after viral gastroenteritis could be Guillain-Barré syndrome (GBS), an autoimmune reaction that affects nerve cells and causes weakness and paralysis. The absence of cells and elevated protein in the spinal fluid is consistent with GBS.
Step-by-step explanation:
The weakness in the limbs 2 weeks after a viral gastroenteritis could be a result of Guillain-Barré syndrome (GBS), which is a rare condition that can be triggered by a viral infection. GBS is an autoimmune reaction that leads to the destruction of myelinated nerve cells, causing a loss of sensation and function. In some cases, the weakness can progress to complete paralysis. In GBS, the symptoms of weakness in the upper and lower extremities with absent deep tendon reflexes are characteristic. The spinal fluid analysis showing no cells but elevated protein is also consistent with GBS. It's important for the individual to seek medical attention for further evaluation and treatment.