Immunodeficiency with factor I anomaly

What is Immunodeficiency with factor I anomaly?

Immunodeficiency with factor I anomaly is a rare, genetic, primary immunodeficiency disease characterized by increased susceptibility to recurrent, usually severe, infections (particularly by Neisseria meningitidis, Haemophilus influenzae and Streptococcus pneumonia), typically manifesting as otitis, sinusitis, bronchitis, pneumonia, and/or meningitis. Autoimmune disease (e.g. systemic lupus erythematosus, glomerulonephritis) and atypical hemolytic uremic syndrome may be associated. Laboratory serum analysis reveals, in addition to diminished or undetectable complement factor I, variably decreased complement C3, complement factor B and complement factor H.

Other condition names

  • Complete factor I deficiency

Inheritance type

Autosomal recessive


  • Worldwide: <1 in 1,000 000
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