Prophylaxis of meningococcal meningitis is
**Core Concept**
Meningococcal meningitis is a severe infection caused by the bacterium Neisseria meningitidis. Prophylaxis involves measures to prevent the spread of the disease, especially in high-risk populations such as infants, young children, and individuals with certain underlying medical conditions. Vaccination is a crucial aspect of meningococcal meningitis prophylaxis.
**Why the Correct Answer is Right**
The correct answer is based on the recommendation to administer meningococcal conjugate vaccine (MenACWY) to infants and young children. This vaccine induces immunity against the serogroups A, C, W, and Y of Neisseria meningitidis. The vaccine is highly effective in preventing meningococcal meningitis and is recommended for routine administration at 2, 4, and 12 months of age, with a booster dose at 16 years of age. The vaccine works by stimulating the production of antibodies against the meningococcal capsular polysaccharide, which is the primary virulence factor of the bacteria.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because meningococcal meningitis is not typically prevented by administering antibiotics as a prophylactic measure. While antibiotics may be used to treat the infection, they are not effective in preventing its spread.
* **Option B:** This option is incorrect because the Bexsero vaccine (MenB) is a monovalent vaccine that provides protection against serogroup B meningococcus, but it is not the primary vaccine recommended for routine use in infants and young children.
* **Option D:** This option is incorrect because the use of meningococcal polysaccharide vaccine (MenPS) is not recommended for routine use in infants and young children due to its limited efficacy in this age group.
**Clinical Pearl / High-Yield Fact**
It is essential to note that meningococcal meningitis can be prevented through vaccination, and individuals who are at high risk of contracting the disease should receive the recommended vaccine. The Centers for Disease Control and Prevention (CDC) and the American Academy of Pediatrics (AAP) recommend routine administration of meningococcal conjugate vaccine (MenACWY) to infants and young children.
**Correct Answer:** C.