Routine vaccination against meningococcus is recommended by the Centers for Disease Control and Prevention for all 11- to 18-year-olds and people who have poor splenic function (who, for example, have had their spleen removed or who have sickle-cell disease which damages the spleen), or who have certain immune disorders, such as a complement deficiency.
Waterhouse–Friderichsen syndrome
Woodhouse–Sakati syndrome
Michels Caskey syndrome
Johanson–Blizzard syndrome
Hashimoto's encephalopathy
Wellens' syndrome
Hemolytic–uremic syndrome
Primrose syndrome