All of the following statements are true regarding central nervous system infection, except –
**Core Concept**
Central nervous system (CNS) infections involve the brain or spinal cord, and can be caused by bacteria, viruses, fungi, or parasites. These infections can lead to meningitis (inflammation of the meninges) or encephalitis (inflammation of the brain tissue).
**Why the Correct Answer is Right**
The correct answer will be the statement that does not accurately describe a CNS infection. CNS infections can be acute or subacute, and can present with symptoms such as fever, headache, stiff neck, confusion, and altered mental status. The pathophysiology of CNS infections involves the invasion of microorganisms into the CNS, leading to inflammation and damage to brain tissue.
**Why Each Wrong Option is Incorrect**
**Option A:** This statement is true, as CNS infections can be caused by a variety of pathogens, including bacteria (e.g., *Neisseria meningitidis*), viruses (e.g., herpes simplex virus), fungi (e.g., *Cryptococcus neoformans*), and parasites (e.g., *Toxoplasma gondii*).
**Option B:** This statement is true, as CNS infections can present with a wide range of symptoms, including fever, headache, stiff neck, confusion, and altered mental status.
**Option C:** This statement is false, as CNS infections can be caused by a variety of pathogens, including viruses (e.g., herpes simplex virus), which do not require a bacterial endotoxin to cause disease.
**Option D:** This statement is true, as CNS infections can be caused by a variety of pathogens, including bacteria (e.g., *Streptococcus pneumoniae*), which can produce bacterial endotoxins that trigger an inflammatory response.
**Clinical Pearl / High-Yield Fact**
When evaluating a patient with suspected CNS infection, it is essential to consider the patient's symptoms, laboratory results, and imaging studies to determine the underlying cause of the infection. A high index of suspicion is necessary, as CNS infections can be life-threatening if not promptly treated.
**Correct Answer: C.**