After splenectomy, the most common infection:
**Core Concept**
The spleen plays a crucial role in filtering the blood, storing red blood cells, and housing immune cells, particularly macrophages and dendritic cells. After splenectomy, patients are at increased risk of infections due to the loss of these immune functions, particularly for encapsulated bacteria.
**Why the Correct Answer is Right**
The most common infection after splenectomy is encapsulated bacterial infections, such as Streptococcus pneumoniae, Haemophilus influenzae, and Neisseria meningitidis. These bacteria have a polysaccharide capsule that the spleen would normally filter out. Without the spleen, patients are more susceptible to these infections, which can lead to severe disease, including meningitis, bacteremia, and sepsis. The loss of the spleen's immune function also impairs the ability to clear these pathogens from the bloodstream.
**Why Each Wrong Option is Incorrect**
* **Option A:** While infections are common after splenectomy, the most common ones are not viral, such as influenza or herpes simplex.
* **Option B:** Fungal infections, such as candidiasis, can occur in immunocompromised patients, but they are not the most common type after splenectomy.
* **Option C:** Parasitic infections, such as malaria, are not typically associated with an increased risk after splenectomy.
**Clinical Pearl / High-Yield Fact**
Patients who have undergone splenectomy should receive prophylactic antibiotics, such as penicillin or amoxicillin, for at least 2 years to reduce the risk of encapsulated bacterial infections. This is a critical aspect of post-surgical care for these patients.
**Correct Answer:** Not provided. Please provide the correct answer for the missing options.