**Core Concept**
Meningococcal meningitis is a severe, life-threatening infection caused by the bacterium Neisseria meningitidis. It primarily affects the meninges, the protective membranes surrounding the brain and spinal cord, leading to inflammation and potential brain damage.

**Why the Correct Answer is Right**
The correct answer will be an option that is not true about meningococcal meningitis. This bacterium is highly contagious and can be spread through respiratory droplets, close contact, or sharing utensils and personal items. The infection can progress rapidly, leading to severe symptoms such as fever, headache, stiff neck, and altered mental status.

**Why Each Wrong Option is Incorrect**
**Option A:** Meningococcal meningitis is typically a self-limiting disease. **Incorrect** because meningococcal meningitis is a severe and potentially life-threatening disease that requires prompt medical attention and treatment.
**Option B:** Vaccination is not effective against meningococcal meningitis. **Incorrect** because meningococcal conjugate vaccines are highly effective in preventing meningococcal disease, including meningitis.
**Option C:** Meningococcal meningitis is usually caused by a viral infection. **Incorrect** because meningococcal meningitis is caused by the bacterium Neisseria meningitidis, not a viral infection.
**Option D:** Meningococcal meningitis can be treated with antibiotics alone. **Incorrect** because while antibiotics are a critical component of treatment, patients may also require supportive care, such as hydration and respiratory support, and may require surgical intervention in some cases.

**Clinical Pearl / High-Yield Fact**
Meningococcal meningitis can progress rapidly, and early recognition and treatment are crucial to prevent long-term consequences and mortality. Clinicians should be aware of the classic symptoms and risk factors for this disease, including exposure to large crowds, travel to endemic areas, and underlying immunocompromised conditions.

**Correct Answer:** C. Meningococcal meningitis is usually caused by a viral infection.