Immunodeficiency due to a classical component pathway complement deficiency

What is Immunodeficiency due to a classical component pathway complement deficiency?

Immunodeficiency due to a classical component pathway complement deficiency is a primary immunodeficiency due to a deficiency in either complement components C1q, C1r, C1s, C2 or C4 characterized by increased susceptibility to bacterial infections, particularly with encapsulated bacteria, and increased risk for autoimmune disease. Most commonly, these include systemic lupus erythematosus (SLE), SLE-like disease, Henoch-Schonlein purpura, polymyositis and arthralgia. Disease severity is variable and dependent on the complement affected.

Other condition names

  • Immunodeficiency due to C1, C4, or C2 component complement deficiency
  • Immunodeficiency due to an early component of complement deficiency
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