“…The association of factor I deficiency and abnormality in factor H electrophoretic migration has been observed previously (11,21) and may be explained by binding of factor H to C3b. Another Brazilian family has been studied in our laboratory in which two sisters present this same deficiency (22). The oldest daughter developed systemic lupus erythematosus and the youngest daughter, although she had not previously developed autoimmune or recurrent infections, died of sepsis at the age of 3 years (22).…”