**Question:** Post-splenectomy patient is in need of ______’ vaccination -

A. Haemophilus influenzae type b (Hib)
B. Streptococcus pneumoniae
C. Neisseria meningitidis
D. Influenza

**Core Concept:**

Splenectomy is the surgical removal of the spleen. The spleen plays a crucial role in the immune system, particularly in the clearance of pathogens and production of antibodies. In a splenectomized patient, the immune system is compromised, making them susceptible to infections caused by certain bacteria and viruses.

**Why the Correct Answer is Right:**

Post-splenectomy patients are at risk of severe infections due to the loss of the spleen's immunological function. The correct answer, **C. Neisseria meningitidis**, is important because meningococcus is a group of bacteria that can cause severe invasive infections, such as meningitis and sepsis. This bacterium is known to bind to the Fc region of immunoglobulins, which is a function that the spleen typically performs, and its loss in a splenectomized patient increases the risk of meningococcal infections.

**Why Each Wrong Option is Incorrect:**

A. **Haemophilus influenzae type b (Hib)** is a bacterium that can cause invasive infections like meningitis, pneumonia, and septicemia. However, the answer is wrong because Hib is less commonly associated with post-splenectomy infections compared to Neisseria meningitidis.

B. **Streptococcus pneumoniae** is another bacterium that can cause severe infections, including pneumonia and meningitis. However, the answer is wrong because the primary risk of infection after splenectomy is due to Neisseria meningitidis, not Streptococcus pneumoniae.

D. **Influenza** is a virus that causes seasonal influenza and is not directly related to splenectomy. The answer is wrong because the primary focus of vaccination for splenectomized patients should be on bacterial infections, particularly Neisseria meningitidis and Streptococcus pneumoniae.

**Clinical Pearl:**

Post-splenectomy patients should receive a polysaccharide vaccine against Neisseria meningitidis and pneumococcal polysaccharide vaccine to protect against Streptococcus pneumoniae. Additionally, all patients undergoing splenectomy should be advised to carry a card or wear a medical alert bracelet indicating their splenectomy status, as they may face challenges in accessing healthcare during an infection episode. This precaution helps healthcare providers understand the patient's immunocompromised condition and prioritize their care accordingly.