Answer :
The described symptoms suggest possible meningitis. The first investigation to recommend is a lumbar puncture to analyze the cerebrospinal fluid for signs of infection.
The symptoms the student has presented suggest a possible case of meningitis, an inflammation of the brain and spinal cord membranes. Therefore, the recommended investigation to perform first would be a lumbar puncture (also known as a spinal tap). This procedure can help in analyzing the cerebrospinal fluid for signs of infection.
Additional symptoms such as sensitivity to light, neck stiffness, headache, and fever further strengthen the diagnosis of meningitis. A lumbar puncture can confirm this diagnosis by showing an increased white cell count, elevated protein, and decreased glucose in the cerebrospinal fluid.
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