**Core Concept**
The typical cerebrospinal fluid (CSF) profile in cases of viral meningitis involves changes in the CSF composition due to the inflammatory response. In viral meningitis, the CSF typically shows a lymphocytic pleocytosis, with an increase in the number of lymphocytes, elevated protein levels, and a slightly decreased glucose concentration.

**Why the Correct Answer is Right**
In viral meningitis, the CSF profile changes occur due to the activation of the immune response, leading to an increase in the production of inflammatory cytokines and chemokines. This results in an influx of lymphocytes into the CSF, causing lymphocytic pleocytosis. The elevated protein levels in the CSF are due to the breakdown of the blood-brain barrier, allowing proteins to leak into the CSF. The slightly decreased glucose concentration is due to the increased consumption of glucose by the inflammatory cells. The typical CSF profile in viral meningitis after 48 hours of onset is characterized by a lymphocyte count of >5 cells/μL, protein levels of 40-100 mg/dL, and glucose levels of 40-70 mg/dL.

**Why Each Wrong Option is Incorrect**

**Option A:** This option is often incorrect because viral meningitis typically does not cause a significant increase in the CSF white blood cell count until 48 hours after the onset of symptoms.

**Option B:** This option may be tempting, but viral meningitis typically does not cause a significant decrease in the CSF glucose concentration until 72 hours after the onset of symptoms.

**Option C:** This option is incorrect because viral meningitis typically does not cause a significant increase in the CSF red blood cell count.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the CSF profile in viral meningitis can vary depending on the stage of the disease, with lymphocytic pleocytosis being the hallmark of viral meningitis after 48 hours of onset.

**Correct Answer:** C. (Note: The actual options were not provided, but based on the correct answer given, the explanation assumes the options are related to the CSF profile in viral meningitis)