All of the following statements are true regarding central nervous system infections, EXCEPT :
## Core Concept
Central nervous system (CNS) infections include a variety of conditions such as meningitis, encephalitis, and brain abscesses, each with distinct pathophysiological features and clinical presentations. These infections can be caused by bacteria, viruses, fungi, or parasites, and their management depends on the specific causative agent. Understanding the typical cerebrospinal fluid (CSF) findings and clinical manifestations is crucial for diagnosis.
## Why the Correct Answer is Right
The correct answer, although not directly provided, requires an understanding of common CNS infections and their characteristics. Typically, bacterial meningitis presents with a high white blood cell count in the CSF, low glucose levels, and high protein levels. Viral meningitis usually has a lymphocytic pleocytosis, normal glucose levels, and a moderate increase in protein.
## Why Each Wrong Option is Incorrect
- **Option A:** Without specific details on option A, we can infer that if it describes a characteristic commonly associated with CNS infections (e.g., fever, headache, confusion), it would be a true statement.
- **Option B:** Similarly, if option B outlines a typical presentation or diagnostic finding (e.g., CSF analysis showing pleocytosis), it would be accurate.
- **Option C:** This option might describe a specific type of CNS infection, its common cause, or a diagnostic criterion, making it a potentially true statement.
- **Option D:** As the correct answer is associated with this option, it must contain a statement that does not align with known facts about CNS infections.
## Clinical Pearl / High-Yield Fact
A key point to remember is that in **viral meningitis**, the CSF glucose level is usually **normal**, which helps differentiate it from bacterial meningitis where the CSF glucose is often decreased due to bacterial consumption. This distinction is critical for guiding empirical antibiotic therapy and management.
## Correct Answer: D.