Complement deficiencies are rare and currently not well characterized, so there has been difficulty detecting them. Currently, complement deficiencies only comprise approximately 2% of all primary immunodeficiency disorders. While the frequency of<unk>  has not been assessed worldwide, the risk of meningococcal infection in an individual with<unk>  has been calculated to be around 50%.
Properdin deficiency
Vitamin K deficiency
Factor I deficiency
Familial isolated vitamin E deficiency
Folate deficiency
Hypodysfibrinogenemia
Factor XIII deficiency
Factor X deficiency