After splenectomy, the most common infection:: (A) Pneumococci, (B) E. coli, (C) Klebsiella, (D) Streptococcus
Answer is A. Splenectomy increases the risk of following infections:

Bacterial:
Pneumococcal
H. influenzae
Some Gram -ve enteric organism
Parasitic – Babesia
Viral – No ↑ in risk of viral infection