Recurrent Neisseria infections due to factor D deficiency

Recurrent Neisseria infections due to factor D deficiency (also known as complement factor D deficiency or properdin factor D deficiency) is an extremely rare primary immunodeficiency disorder caused by a deficiency of complement factor D, a key serine protease in the alternative pathway of the complement system. Factor D is essential for cleaving factor B when it is bound to C3b, thereby initiating and amplifying the alternative complement pathway. Without functional factor D, the alternative pathway cannot be properly activated, leaving affected individuals highly susceptible to invasive infections by encapsulated bacteria, particularly Neisseria meningitidis (meningococcus) and Neisseria gonorrhoeae. The disease primarily affects the immune system, with clinical manifestations including recurrent and severe meningococcal meningitis, meningococcal septicemia (meningococcemia), and other invasive Neisseria infections. These infections can be life-threatening and may present in childhood or early adulthood. Affected individuals may experience multiple episodes of meningococcal disease, which is unusual in the general population. Other encapsulated organisms such as Streptococcus pneumoniae may also cause serious infections in these patients. Management focuses on prevention and early treatment of infections. Vaccination against Neisseria meningitidis (meningococcal vaccine covering multiple serogroups) is strongly recommended, although vaccine efficacy may be reduced due to the underlying complement deficiency. Prophylactic antibiotics may be considered in some cases. Prompt recognition and aggressive antibiotic treatment of acute infections is critical. Genetic counseling is recommended for affected families. There is currently no curative therapy to restore complement factor D function, and lifelong vigilance against invasive bacterial infections is necessary.

Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.

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