<unk>  is a genetic condition affecting the complement membrane attack complex (MAC). It involves<unk> es of C5, C6, C7, and C8. (While C9 is part of the MAC, and<unk> es have been identified, it is not required for cell lysis.) People with this condition are prone to meningococcal infection. Vaccination may be recommended.
Terminal complement pathway deficiency
Complement 2 deficiency
Complement 3 deficiency
Complement deficiency
Acquired C1 esterase inhibitor deficiency
Leukocyte adhesion molecule deficiency
Neutrophil-specific granule deficiency
CD55 deficiency