<unk>  is a genetic condition affecting complement component<unk>  (C3). People can suffer from either primary or secondary C3 deficiency. Primary C3 deficiency refers to an inherited autosomal-recessive disorder that involves mutations in the gene for C3. Secondary C3 deficiency results from a lack of factor I or factor H, two proteins that are key for the regulation of C3. Both primary and secondary C3 deficiency are characterized by low levels or absence of C3.
Complement 3 deficiency
Complement 2 deficiency
Terminal complement pathway deficiency
Complement deficiency
CD55 deficiency
CDKL5 deficiency disorder
Hyper IgM syndrome
MBL deficiency