Removal of the spleen presents a lifelong risk of infection, in partic
ular the syndrome of overwhelming postsplenectomy sepsis. Streptococcu
s pneumoniae, Haemophilus influenzae and Neisseria meningitides are th
e most common organisms involved, but malaria, babesiosis and DF-2 als
o create a problem. Immunisation with pneumococcal vaccine, H. influen
zae type b vaccine, influenza vaccine and, if in a high risk area, men
ingococcal vaccine is recommended. Lifelong phenoxymethylpenicillin 25
0mg twice daily is also advised, especially in high risk groups such a
s children and immunocompromised patients. If patients are unwilling t
o take medicine lifelong, or are unlikely to comply, an antibiotic sup
ply should be made available at all times and administration should co
mmence at the first sign of illness. It is vital that patients who hav
e had a splenectomy are properly informed of the hazards and the appro
priate measures to be taken, including the risks of malaria and other
less common infections.