Which of the following drug is used for mass prophylaxis for prevention of meningococcal meningtitis?
**Core Concept**
Meningococcal meningitis is a severe infection caused by the bacterium Neisseria meningitidis, which can lead to meningitis and sepsis. Mass prophylaxis is a public health strategy to prevent the spread of the disease in outbreaks or epidemics.
**Why the Correct Answer is Right**
The correct answer is Rifampicin, a broad-spectrum antibiotic that is effective against Neisseria meningitidis. Rifampicin works by inhibiting bacterial RNA synthesis, thereby preventing the replication of the bacteria. In mass prophylaxis, Rifampicin is administered orally to individuals who have been exposed to the bacteria, such as close contacts of a person with meningococcal meningitis, to prevent the development of the disease.
**Why Each Wrong Option is Incorrect**
* **Option A:** Ciprofloxacin is a fluoroquinolone antibiotic that is effective against a wide range of bacteria, but it is not the preferred choice for mass prophylaxis against meningococcal meningitis.
* **Option B:** Ceftriaxone is a third-generation cephalosporin antibiotic that is effective against Neisseria meningitidis, but it is typically used for treatment of established infections rather than mass prophylaxis.
* **Option D:** Penicillin is a beta-lactam antibiotic that was once used to treat meningococcal meningitis, but resistance to penicillin has become a concern, making it less effective for mass prophylaxis.
**Clinical Pearl / High-Yield Fact**
Rifampicin is also used for prophylaxis against other bacterial infections, such as tuberculosis and staphylococcal infections.
**Correct Answer:** C. Rifampicin.